SI Group Phenolic Resins, Antioxidants and Polymer Stabilizers

Selection and quotation of SI Group chemicals: SP-1045, SP-1068 and SP-103 resins for rubber and adhesives, ANOX and LOWINOX antioxidants, WESTON phosphites, LOWILITE stabilizers and POLYBOND modifiers.

Butyl Rubber Curing Resins SP-1045 and SP-1055

SP-1045 is a heat-reactive octylphenol-formaldehyde resin with methylol groups for the resin cure of butyl rubber together with halogen and zinc donors. SP-1055 is a brominated resin of the same type that needs no halogen donor and gives heat-resistant vulcanizates.

SP-1045: softening point 80–95 °C
SP-1045: methylol content 8.0–11.0%
SP-1055: bromine content 3.6–4.0%
SP-1055: methylol content 10–14%

Rubber Tackifying and Reinforcing Resins SP-1068 and SP-6600

SP-1068 is a thermoplastic alkylphenol resin in flakes that keeps long-term tack in tire, tread, hose and belt compounds. SP-1077 raises tack in elastomers, especially EPDM. SP-6600 is a two-step powdered resin with hexa for reinforcing rubber; HRJ-11995 gives harder cured compounds.

SP-1068: 3–13 parts per elastomer
SP-1068: melting point 85–95 °C
SP-1068: acid number 25–42 mg KOH/g
25 kg bags and 1,000 kg big bags

Adhesive Resins SP-103, SP-134 and SP-560

SP-103 is a light-colored alkylphenol-formaldehyde resin for polychloroprene contact cements that extends open time. SP-134 is used with chloroprene rubber in solvent-based contact cements. SP-560 is a rosin-phenolic resin with a high softening point for hot melts and pressure-sensitive adhesives.

SP-103: softening point 87–95 °C
SP-103: up to 25 parts per 100 rubber
SP-560: softening point 140–160 °C
SP-560: acid number 50–70 mg KOH/g

Phenolic Antioxidants ANOX 20 and LOWINOX 22M46

ANOX 20 is a high molecular weight hindered phenol with very low volatility and resistance to extraction from polymers. LOWINOX 22M46 is a non-discoloring bis-phenol for synthetic rubbers and latexes that does not affect vulcanization. ALBLEND 181 is a 1:1 blend of ANOX 20 and ALKANOX 240.

LOWINOX 22M46: melting range 128–132 °C
LOWINOX 22M46: molecular weight 341 g/mol
Bulk density 300–530 kg/m³
ALBLEND 181: 1:1 blend of two grades

Phosphite Stabilizers WESTON, ULTRANOX and ETHAPHOS

WESTON 705 is a nonylphenol-free liquid phosphite for gel protection and color stability in polyethylene and synthetic elastomer production. WESTON 705T replaces TNPP in HDPE, LLDPE, SBR, ABS and PVC. ULTRANOX 626 is a solid organophosphite and ETHAPHOS 368 a hydrolysis-resistant phosphite.

WESTON 705T: phosphorus 5.0%
WESTON 705T: 5% weight loss at 293 °C
ULTRANOX 626: TIPA max. 1.0%
WESTON 705: FDA and EFSA food contact

Aminic Antioxidants and Antiozonants NAUGARD, FLEXZONE, DURAZONE

NAUGARD 445 is a non-discoloring solid aromatic amine antioxidant for polyolefins, styrenics, polyols, hot melts and polyamides. FLEXZONE 4L protects rubber against oxygen and gives initial static ozone protection. DURAZONE 37 is a non-staining antiozonant for static and dynamic protection.

DURAZONE 37: 2–4 parts per 100 rubber
DURAZONE 37: no stain to white stock
FLEXZONE 4L: active in promoting cure
NAUGARD 445: non-discoloring amine

LOWILITE UV Stabilizers 94, 77 and 26

LOWILITE 94 is a high molecular weight Hindered Amine Light Stabilizer (HALS) that protects organic polymers against degradation from ultraviolet radiation. LOWILITE 77 belongs to the same HALS family. LOWILITE 26 is an ultraviolet light absorber of the benzotriazole class.

LOWILITE 94: high molecular weight HALS
LOWILITE 77: HALS family stabilizer
LOWILITE 26: benzotriazole UV absorber
Classed as primary and UV stabilizers

Polymer Modifiers POLYBOND and ROYALTUF

POLYBOND 3200 is a maleic anhydride modified polypropylene: a coupling agent for glass fiber, cellulose fiber and mineral filled PP and a compatibilizer for PP and polyamide blends. POLYBOND 1001N bonds aluminum and steel laminates. ROYALTUF 498 is a maleated EPDM for impact modified polyamides.

POLYBOND 3200: MFR 115 g/10 min
POLYBOND 3200: melting point 157 °C
Maleic anhydride 0.8–1.2%
ROYALTUF 498: Tg −46 °C

Resin Cure and Tack of Rubber Compounds

SP-1045 is designed for the resin cure of butyl rubber together with halogen and zinc donors: the vulcanizates resist high heat and compression set and are non-blooming and non-staining. The manufacturer names tire curing bladders, conveyor belts and gaskets among the uses of resin cured butyl.

The resin is added on a 2-roll mill or in the last mixer pass to prevent premature cure. SP-1055 contains 3.6–4.0% bromine, needs no halogen donor and gives good scorch safety.

SP-1068 is added at the start of mixing together with the elastomers at 3–13 parts; shelf life is 365 days from manufacture. SP-560 is stored at max. 35 °C and used within two years.

Primary and Secondary Polymer Stabilizers

The manufacturer classes the hindered phenols ANOX 20 and LOWINOX 22M46 as primary stabilizers and the WESTON and ULTRANOX phosphites as secondary stabilizers.

ETHAPHOS 368 is approved by the FDA for indirect food contact and works together with phenolic antioxidants, acid neutralizers and UV stabilizers. WESTON 705T dissolves at more than 100 g per 100 g of acetone or cyclohexane and below 0.5 g in water.

At the recommended doses LOWINOX 22M46 does not bloom during vulcanization and leaves no stains on lacquered surfaces. The grade is chosen by polymer, processing temperature, color and food contact requirements.

ETHANOX 4701 Antioxidant for Oils and Fuels

ETHANOX 4701 is a single-ringed phenolic antioxidant whose major component is 2,6-di-tert-butylphenol; it serves industrial lubricants, greases, automotive fluids and fuels.

Its low melting point of 36 °C permits bulk handling in liquid form, and the flash point is 114 °C. For R&O hydraulic oil packages the manufacturer gives 0.25 wt%, for transformer oils 0.15 wt%. The 2,4,6-tri-tert-butylphenol content is below 10 ppm.

Alkylphenols and Production Base

SI Group alkylphenols are chemical intermediates: para-tert-butylphenol goes into polycarbonate chain terminators, glycidyl ethers and phenolic resins, para-tert-octylphenol into surfactants, tackifier resins and ink resins.

The company traces its roots to the 1890s, and the combined SI Group organization was formed in 2018. Today it has about 1,500 employees and 18 manufacturing sites on three continents, customers in more than 80 countries and its headquarters in The Woodlands, Texas, USA.

SI Group and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of SI Group and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.