Polyacrylate rubber

Variation of melt viscosity for both the preblends and preheated blends with the blend ratio are shown in Fig. 19. There are two distinct regions in viscosity change with the addition of polyacrylic rubber (ACM) in the blends. First, in the higher shear rate region, the viscosity increases with the addition of the ACM (up to 40% ACM) in the blend and then it decreases. In the lower... 

Also known as hexamine, hexa or HMT, a once-popular aldehyde-amine type of accelerator for natural rubber, now used as a vulcanising agent for polyacrylate rubbers. 

Newer polyacrylate rubbers can be cured with certain amines and are more responsive to a broad range of curative systems, e.g., alkali metal stearate/sulphur or sulphur donor, methyl zimate and ammonium adipate. 

Uses. Accelerator in the curing of poly-chloroprene (neoprene) and polyacrylate rubber intermediate in the manufacture of antioxidants, insecticides, fungicides, dyes, pharmaceuticals, and synthetic resins... 

According to some workers, H bonds play a part in the formation of novolak resins (1929) and polyacrylic rubber (1829), and in the adhesion of rubber to rayon tire-cord (1125). Hydrogen bonds may be a factor in oil oxidation (149), which is of interest in the deterioration... 

FIGURE 9.17 Dependence of productivity and separation factor /3p C6H5CH3/H2O of membranes based on various rubbery polymers on the glass transition temperature of the polymer (pervaporation separation of saturated toluene/water mixture, T = 308 K) (1) polydimethyl siloxane (2) polybutadiene (3) polyoctylmethyl siloxane (4) nitrile butadiene rubber with 18% mol of nitrile groups (5) the same, 28% mol of nitrile groups (6) the same, 38% mol of nitrile groups (7) ethylene/propylene copolymer (8) polyepichlorohydrin (9) polychloroprene (10) pol3furethane (11) polyacrylate rubber (12) fluorocarbon elastomer. (From analysis of data presented in Semenova, S.I., J. Membr. Sci., 231, 189, 2004. With permission.)... 

Crl-Loy. [Cri-Tech] Fluorosilicone or polyacrylate rubber alloys for o-rings, diaphragms, hoses, stem seals, valve cover gaskets. 

There is sufficient evidence for the carcinogenicity of ETU in experimental animals. When administrated in the diet, ETU induced increased incidences of thyroid follicular cell carcinomas and papillary carcinomas with some metastases and liver hyperplastic nodules in rats of both sexes. There is inadequate evidence fw the carcinogenicity of ETU in humans [42]. ETU is used primarily as an accelerator for vulcanizing polychloropene and polyacrylate rubbers. The primary routes of potential human exposure to ETU are inhalation, ingestion and dermal contact. Potential occupational exposure also occurs during the manufacture of Cumulation and rqrplication of fungicides and insecticides prepmed from ETU. Residues of the compound have been found in 28 different commercial ethylenebisdithiocarbamates products [59]. 

Bayer and BASF have developed a PC/ASA blend where ASA is the rubber variant of ABS in which the polybutadiene phase is completely replaced by a polyacrylate rubber. Compared to PC/ABS alloys, the PC/ASA blend has greater resistance to weathering, which permits outdoor applications and an extra heat stability that reduces the risk of yellowing in processing. BASFs alloy, Terblend S, is recommended for outdoor applications as it has six times the UV resistance of PC/ABS and an even higher resistance when pigmented. 

Details A solid, which is an accelerator and vulcanising agent for chloroprene rubber (Neoprene) and polyacrylate rubber. 

Uses Monomer for solv.-resist. elastomers, polyacrylate rubbers, UV-curable reactive diluent, soft contact lenses, PVC impact modifier, fabric coatings, barrier coatings for polyethylene, textile coatings Properties APHA 50 color m.w. 130.15 sp.gr. 1.012 (20/20 C) flash pt. 82 C 98.5% act. 

Uses Prod, of solv.-resistant elastomers, polyacrylate rubbers UV-cur-able reactive diluent soft contact lenses PVC impact modifier fabric coatings barrier coatings for polyethylene textile coalings plasticizer softener... 

Polyacrylic acid, potassium salt. See Potassium polyactylate Polyacrylic acid, sodium salt. See Sodium polyacrylate Polyacrylic rubber. SeeAcrylic elastomer... 

Acrylic aldehyde. See Acrolein Acrylic amide. See Acrylamide Acrylic copolymer. See Acrylates copolymer Acrylic elastomer Synonyms Polyacrylic rubber Uses Textile, nonwoven, adhesive bindings, coatings, finishes, seals and gaskets Features Low temp.-resistant Trade Name Synonyms Cyanacryl 35 f [Cytec Ind. http //www.cytec.com]] HyStretch T-35 t[Noveon http //www.noveoninc.com] http //WWW. carbopoi. com] http //www.noveoncoatings.com]] HyStretch V-29 [Noveon http //www.noveoninc.com] http //WWW. carbopoi. com http //www.noveoncoatings.com]] HyStretch ... 

Examples of vulcanizable elastomers include natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (BR), ethylene-propylene-diene monomer-rubber (EPDM), butyl rubber (HR), polychloroprene or neoprene (CR), epichlorohydrin rubber (ECO), polyacrylate rubber (ACM), millable polyurethane rubber, silicone rubber, and flu-oroelastomers. Examples of thermoplastic elastomers include thermoplastic polyurethane elastomers, styrenic thermoplastic elastomers, polyolefin-based thermoplastic elastomers, thermoplastic polyether-ester (copolyester) elastomers, and thermoplastic elastomers based on polyamides. 

Acrylic rubber can be emulsion- and suspension-polymerized from acrylic esters such as ethyl, butyl, and/or methoxyethyl acetate to produce polymers of ethyl acetate and copolymers of ethyl, butyl, and methoxyl acetate. Polyacrylate rubber, such as Acron from Cancarb Ltd., Alberta, Canada, possesses heat resistance and oil resistance between nitrile and silicone rubbers. Acrylic rubbers retain properties in the presence of hot oils and other automotive fluids, and resist softening or cracking when exposed to air up to 392°F (200°C). The copolymers retain flexibility down to -40°F (-40°C). Automotive seals and gaskets comprise a major market. These properties and inherent ozone resistance are largely due to the polymer s saturated backbone (see Table 3.13). 

In 1971 Unitika Co. Ltd. issued a series of patent applications for blends of polyarylates (produced by polycondensation of iso- and terephthahc adds with bisphenol-A), PAr, with 30 % ABS, polyacrylate rubber, PP, EVAc, PE, with 5 - 90 % PC, and 50 % PET. The later blends with excellent processability, moldabiUty, good toughness and impact strength were commercialized as U-8000. Over the years PAr has been blended with nearly all commerdal resins, including ABS, EPDM, lonomers, LCP, PA, PB,... 

Polyacrylate rubber, on the face of it, also looks a good candidate, but it is badly affected by hydrolysis in aqueous environments. This may account for the fact that it seems to be used hardly at all in the oil industry. ... 

While natural rubber began as the basis for automobile tires, synthetic rubber products replaced natural rubber - partly as a consequence of the rubber shortage of World War II. Synthetic rubber products include styrene-butadiene rubber (SBR), polybutadiene rubber (BR), polyisoprene rubber (IR), nitrile rubber, neoprenes, polysulfides, polyacrylate rubber, and a host of other products with 65% of all SBR... 

The most widely used elastomers are natural rubber [17], synthetic polyisoprene and butadiene rubbers, styrene-butadiene copolymers, ethylene-propylene rubber (specifically EPDM), butyl and halobutyl elastomers, polyurethanes, polysiloxanes, polychloroprenes, nitrile rubber, polyacrylic rubbers, fluorocarbon elastomers, and thermoplastic elastomers [18-20]. The examples which have unsaturation present in the repeat units (such as, the diene elastomers) have the advantage of easy cross-linkability, but the disadvantage of increased vulnerability to attack by reactants, such as oxygen and ozone. 

Acrylic rubber Polyacrylate rubber Polyacrylate-acrylic acid ester Acrylester rubber Poly (acrylic acid ester rubber)... 

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