Phenolic Resins
Tackifer Resins
Tackifer resins are used as an additive to impart tack in synthetic rubbers that do not
possess the inherent tack necessary for plied-up construction. The largest use for these
types of resins is in tire building. For tire building applications a typical usage is 3-8 phr.
Akrochem’s phenolic tackifer resins for this application and others like it are as follows:
GENERAL PURPOSE
SP-1068 (P-90)
SP-1068 is an unmodifed, thermoplastic resin made from octylphenol and
formaldehyde. It is typically used to increase tack in natural and synthetic elastomers,
including SBR, BR, IIR and IR. SP-1068 has the lowest temperature softening point of
our general purpose tackifer resins.
HRJ-4047 (P-165)
HRJ-4047 is an unmodifed, thermoplastic resin made from octylphenol and
formaldehyde. It is compatible with natural and synthetic elastomers, including SBR,
BR, IIR and IR. It is a good general purpose tackifer, similar to SP-1068, but with a higher
temperature softening point.
RIBETAK 7510P
Ribetak 7510P is an alkyl-phenol, thermoplastic resin. It is recommended for natural and
synthetic elastomers, including SBR, BR, IIR, IR, and EPDM. It is a good general purpose
tackifer similar to SP-1068.
Phenolic Resins are
products of
SI Group and
Ask Chemicals.
© SI Group, 2015
MODIFIED/HIGH PERFORMANCE
SP-1077 (P-133)
SP-1077 is a modifed, thermoplastic alkylphenol resin developed as a tackifer for
synthetic and natural elastomers, including SBR, BR, IIR, IR and EPDM. It has been
found that adequate tack levels can be achieved using lower levels of SP-1077 than is
possible with conventional tackifers, such as SP-1068. In addition, SP-1077 provides
tack in diffcult to tackify compounds, such as EPDM.
HRJ-10420
HRJ-10420 is a thermoplastic resin made from octylphenol and formaldehyde. It is
used to increase tack in natural and synthetic elastomers, including SBR, BR, IIR,
and IR. Typical loadings range from 3-8 phr.
ELAZTOBOND T-6000 (P-182)
T-6000 is a modifed phenol-formaldehyde resin specially modifed to increase
tack properties in Natural Rubber, Polybutadiene and SBR. Its unique qualities also
provide unusual tack in hard to tackify materials like EPDM and NBR. Its high
softening point yields good holding strength at higher temperatures. Typical
loadings range from 2-15 phr.
Tackifer Resins
Product
Ball & Ring Softening Point (°C)
Physical Form
Specifc Gravity
General Purpose
SP-1068 (P-90)
85 - 95
Pellet
1.03
RIBETAK 7510P
90-105
Pastille
1.10
HRJ-4047 (P-165)
92 - 101
Pellet
1.04
HRJ-10420
97-107
Pellet
1.02
Modifed/High Performance
SP-1077 (P-133)
92 - 102
Flake
1.04
ELAZTOBOND T-6000(P-182)
110 - 120
Lump
1.25
Terpene Phenolic Resins
The major use of terpene phenolic resins is in the feld of adhesives. The use of
terpene phenolic resins will improve the adhesion of hot-melt packaging and
pressure sensitive adhesives to substrates like coated and recycled paper, glass and
metal foils that are typically tough to bond to. Terpene phenolics are often used in
combination with a heat reactive resin to gain a balance of properties. Their function
in a resin system is to increase the open time and tack of the adhesive. Akrochem’s
terpene phenolic resins for this application and others like it are as follows:
SP-560 (P-03)
SP-560 is a thermoplastic, oil-soluble, terpene phenolic resin. This resin is used
mainly in adhesives as either the base resin or as a modifying resin in the formulation
of polychloroprene cements. It can also be used in hot-melt or solution adhesives
made from other elastomers where the combination of high tack and high heat
performance is desired. To improve the high temperature performance of cements,
SP-560 may be blended in any proportion with heat reactive resins. The heat
resistance of the adhesive formulation will increase along with the percentage of
heat reactive resin, but this will be gained at the expense of decreasing open time.
Terpene Phenolic Resins
Product
Ball & Ring Softening Point (°C)
Physical Form
Specifc Gravity
SP-560 (P-03)
146 - 160
Flake
1.10
© SI Group, 2015
Bonding/Adhesion Promoters
Bonding/adhesion promoters are designed to help rubber compounds form
permanent bonds to non-rubber portions, fbers, fabrics and metals. Akrochem’s
bonding/adhesion promoter resins for this application and others like it are as follows:
ELAZTOBOND A-250 (P-185)
A-250 is a modifed phenol-formaldehyde resin that has been developed as a
replacement for resorcinol-formaldehyde resins. In combination with a methylene
donor such as hexamethylenetetramine (AKROFORM® HMT-80/EPR/P) or
hexamethoxymethylmelamine (AKROSPERSE® HMMM-50/EPR/S) and silica, A-250
resin functions as an adhesion promoter. The A-250, hexa,and silica loadings typically
fall within the following ranges: 2-4, 1-4 and 10-25 phr, respectively. A-250 resin has
replaced straight resorcinol in many applications due to improved dispersibility and
health concerns. A-250 is especially important in polychloroprene fabric adhesion,
since normal resorcinol can scorch polychloroprene.
Bonding/Adhesion Promoters
Product
Ball & Ring Softening Point (°C)
Physical Form
Specifc Gravity
ELAZTOBOND A-250 (P-185)
100 - 110
Flake
1.25
Reinforcing (Two-Step) Resins
Reinforcing or two-step resins are signifcant in rubber, adding useful properties to a
compound. The properties that reinforcing resins impart are: increased hardness,
lower compound viscosity, higher tensile, shorter elongation, chemical resistance
and higher abrasion resistance. These resins also act as a process aid for stiff, highly
loaded compounds.
Reinforcing resins are generally oil modifed with either tall oil or cashew nut oil.
The main purpose of the modifying oil is to make the resin more compatible with the
polymer, but it also makes the resin more fexible after it is cured and acts as a process
aid as well. These resins are cured with hexamethylenetetramine and are available with
or without the hexa already added. Akrochem’s reinforcing (two-step) resins for this
application and others like it are as follows:
WITH HEXA
SP-6600 (P-87)
SP-6600 is a cashew nut oil modifed phenol-formaldehyde two-step resin. It exhibits
compatibility in all proportions with NBR. During processing, the resin plasticizes the
stock, making fller loading and milling easier. In the cured state, increases in the resin
content will decrease elongation but will increase tensile strength, fexural strength,
hardness, abrasion resistance and rigidity. SP-6600 has limited compatibility with SBR
and CR. However, within these compatibility limits, it is used to reinforce these rubbers.
SP-6601 (P-55)
SP-6601 is a tall oil modifed phenol-formaldehyde two-step resin with hexa. It was
primarily designed for use in SBR compounds. As a rule, phenolic resins have little or no
compatibility with SBR. SP-6601 resin, however, is an exception in that as much as 50 phr
of the resin (by weight) on 100 phr (by weight) of SBR can be used before compatibility
problems are encountered. If compatibility with SBR becomes an issue, try adding NBR
which will serve as a common solvent or fux to help overcome potential issues. This resin
serves as an effective plasticizer during processing and facilitates pigment dispersion.
Increasing the amounts of SP-6601 resin will increase the hardness and abrasion
resistance of SBR vulcanizates.
SP-8855 (P-40) [Product of ASK Chemicals]
SP-8855 is an unmodifed phenol-formaldehyde two-step resin containing hexa.
SP-8855 is used as a hardening and reinforcing agent for NBR, NBR-SBR blends,
CSPE and Polybutadiene polymers. It has medium fow, cure and setting properties.
WITHOUT HEXA
SP-6700 (P-86)
SP-6700 is a cashew nut oil modifed phenol-formaldehyde resin. It does not contain
hexa and is the base resin that is used in the manufacture of SP-6600. It is compatible
in all proportions in nitrile rubber. SP-6700 is produced for those high temperature
compounding cycles where the early presence of hexa could result in scorching.
In banbury operations, it is often more desirable to add hexa to the stock on the sheet
off mill. The quantity of hexa added is dependent on processing conditions and the
physical properties desired.
SP-6701 (P-49)
SP-6701 is a tall oil modifed phenol-formaldehyde resin. It does not contain hexa
and is the base resin that is used in the manufacture of SP-6601. SP-6601 is used
primarily in SBR stocks where high processing temperatures are encountered.
Due to the high temperature compounding cycles, the early presence of hexa
could result in premature cure or scorch. The hexa should be added with the
accelerators and sulfur as the last step in the mixing cycle.
Reinforcing (Two-Step) Resins
Product
Melting Point
Capillary Method (°F)
Physical Form
Hexa Content (%)
Specifc Gravity
With Hexa
SP-6600 (P-87)
140 - 165
Powder
6.5 - 8.5
1.17
SP-6601 (P-55)
145 - 160
Powder
6.5 - 8.5
1.17
SP-8855 (P-40)
170 - 190
Powder
6.0 - 8.0
1.18
Without Hexa
SP-6700 (P-86)
90 - 100*
Flake
None
1.16
SP-6701 (P-49)
90 - 100*
Flake
None
1.16
* Ball & Ring Method (°C)
© SI Group, 2015
One-Step Resins
One-step resins are often referred to as resoles. These resins will cure with the
application of heat and have good compatibility with NBR. These resins are used
primarily in the formulation of solvent-based adhesives. Akrochem’s one-step resin
for this application and others like it is as follows:
BRJ-473 (P-102)
BRJ-473 is a thermosetting phenolic resin used primarily in the formulation of NBR
adhesives. BRJ-473 is supplied as a solution in methyl-ethyl-ketone (MEK) and can
be easily blended directly into solutions of rubber. Adhesives based on combinations
of BRJ-473 with NBR have excellent oil and vinyl plasticizer resistance, high bond
strengths and stable viscosity.
Heat Reactive Resins
The most signifcant use of heat reactive phenolic resins is in modifying the properties of
polychloroprene cements. The addition of phenolic resin, magnesium oxide, zinc oxide
and a small amount of water greatly improves the heat resistance and chemical bonding
of a polychloroprene cement.
A frequent complaint in making polychloroprene adhesives is inadequate open time.
Changing resins, from one with a short open time to one with a longer open time,
is the most common means of dealing with this issue. However, a gain in open time
usually results in a sacrifce in heat resistance. Akrochem’s heat reactive resins for this
application and others like it are as follows:
SP-134 (P-28)
SP-134 is a modifed alkyphenol-formaldehyde resin used in making polychloroprene
contact cements that require long open times. It can also be used in formulating
adhesives with NBR, SBR, Natural and reclaimed rubbers. SP-134 is completely
compatible with NBR and CR. It has a compatibility limit of approximately 25 parts by
weight in combination with 100 parts by weight of SBR, Natural and reclaimed rubbers.
SP-103 (P-109)
SP-103 is a modifed alkylphenol-formaldehyde resin used in making polychloroprene
contact cements. The outstanding features of this resin are its light color and ability
to extend open time without affecting other properties of the fnished adhesive. It can
also be used in formulating adhesives with NBR, SBR, Natural and reclaimed rubbers.
SP-103 is completely compatible with NBR and CR. It has a compatibility limit of
approximately 25 parts by weight in combination with 100 parts by weight of SBR,
Natural and reclaimed rubbers.
One-Step Resins
Product
Melting Point
Capillary Method (°F)
Physical Form
Hexa Content (%)
Specifc Gravity
BRJ-473 (P-102)
N/A
Liquid
None
1.10
SP-154 (P-105)
SP-154 is a heat reactive phenolic resin that was developed for the formulation of solvent-
borne polychloroprene contact cements. It can also be used in formulating adhesives
with NBR, SBR, Natural and reclaimed rubbers. SP-154 is completely compatible with NBR
and CR. It has a compatibility limit of approximately 25 parts by weight in combination
with 100 parts by weight of SBR, Natural and reclaimed rubbers. Adhesives made using
SP-154 have excellent heat resistance, high cohesive strength and light color.
FRJ-551 (P-126)
FRJ-551 is a heat reactive alkylphenolic resin which is designed primarily for use
in the formulation of polychloroprene-based contact adhesives. In adhesives
based on polychloroprene, FRJ-551 gives good bond strength, both at room and
elevated temperatures.
HRJ-1367 (P-148)
HRJ-1367 is an oil soluble, heat reactive, phenolic resin based on a para-substituted
alylphenol. It is used in the formulation of polychloroprene contact cements with good
green strength and heat resistance. The outstanding features of this resin are its high
reactivity, narrow molecular weight and light color. It can also be used in formulating
adhesives with NBR, SBR, Natural and reclaimed rubbers. HRJ-1367 is completely
compatible with NBR and CR. It has a compatibility limit of approximately 25 parts by
weight in combination with 100 parts by weight of SBR, Natural and reclaimed rubbers.
Heat Reactive Resins
Open Time
Heat Resistance
(shortest to longest)
(lowest to highest)
SP-154 (P-105)
SP-103 (P-109)
SP-134 (P-28)
HRJ-1367 (P-148)
FRJ-551 (P-126)
FRJ-551 (P-126)
HRJ-1367 (P-148)
SP-134 (P-28)
SP-103 (P-109)
SP-154 (P-105)
Heat Reactive Resins
Product
Melting Point
Capillary Method (°F)
Physical
Form
Methylol
Content (%)
Color
(Gardner)
Specifc
Gravity
For Coatings
SP-134 (P-28)
140 - 165
Flake
13 - 18
1 - 7
1.10
SP-103 (P-109)
146 - 158
Flake
8 - 11
0 - 7
1.10
SP-154 (P-105)
160 - 190
Flake
8 - 12
1 - 7
1.10
FRJ-551 (P-126)
170 - 195
Flake
12 - 16
0 - 8
1.03
HRJ-1367 (P-148)
92 - 100*
Flake
14 - 18
1 - 6
1.10
* Softening Point - Ball & Ring Method (°C)
Curing Resins
Curing resins are heat reactive resins made from octylphenol and formaldehyde.
They have been developed to cure IIR and NR. Standard butyl curing resins need to
be used in combination with halogen and zinc donors. Bromine modifed curing resins
for butyls do not require a halogen donor. Also available is an unmodifed resin
developed specifcally to cure natural rubber. Akrochem’s curing resins for this
application and others like it are as follows:
UNMODIFIED CURING RESINS FOR BUTYL
SP-1044 (P-146)
SP-1044 is a heat reactive resin made from octylphenol and formaldehyde designed
for the cure of IIR by the resin cure system. SP-1044 used in combination with halogen
and zinc donors, yields butyl vulcanizates with outstanding resistance to high heat and
compression set. In addition, these vulcanizates are non-blooming, non-staining and
have high modulus values. The octyl group also makes SP-1044 compatible with other
elastomers, and can be used to make cements offering a wide range of properties.
SP-1045 (P-101)
SP-1045 is a heat reactive resin made from octylphenol and formaldehyde designed for the
cure of IIR by the resin cure system. The octyl group also makes SP-1045 compatible with
other elastomers, and can be used to make cements offering a wide range of properties.
SP-1045 used in combination with halogen and zinc donors, yields butyl vulcanizates with
outstanding resistance to high heat and compression set. In addition, these vulcanizates
are non-blooming, non-staining and have high modulus values.
MODIFIED CURING RESINS FOR BUTYL
SP-1056 (P-125)
SP-1056 is a heat reactive, brominated (6–7.5%) octylphenol-formaldehyde resin that
contains methylol groups. Due to its higher bromine content, compounds with SP-1056
will cure faster and have less scorch safety than those that utilize SP-1055. SP-1056 may
be used with IIR or other unsaturated elastomers with or without functionality. The
presence of functionality allows for a faster cure. SP-1056 also does not require a halogen
donor. The use of brominated resins in compounding is especially effective when rubber
may be exposed to heat or repeated use. The rubber will not deteriorate as quickly as
rubber crosslinked with other curing agents.
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