Calenderable acrylic polymers and textiles treated therewith
AssigneeRohm and Haas Company
InventorCharles T. Arkens
Life of this patent
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Abstract
There is disclosed a calenderable, soft, three-stage acrylic heteropolymer having a calculated T.sub.g of about (-) 40.degree. to (=) 20.degree. C. which is suitable for producing films and sheets useful to coat textile materials and other substrates to form composites. The heteropolymer can be coagulated and then introduced into a calendering apparatus to produce films and sheets at substantially lower temperatures than are required for calendering vinyl halide polymers.
Claims10
A calenderable, soft, three-stage acrylic polymeric composition, said composition having a calculated T.sub.g of from about (-)40.degree. C. to about (+)20.degree. C., the isolated and dried particles of which comprise about 30-60% by weight of a polymeric first stage, about 30-60% by weight of a polymeric second stage, and about 5-20% by weight of a polymeric third stage, wherein
- (1) said first stage is formed by emulsion polymerization of a first monomer composition having a T.sub.g of about (-)10.degree.. or lower consisting essentially of:
- (a) about 70-95% by weight of at least one (C.sub.1 -C.sub.8) alkyl acrylate,
- (b) about 0-15% by weight of at least one (C.sub.1 -C.sub.8) alkyl methacrylate,
- (c) about 4-10% by weight of a latent cross-linking monomer selected from acrylamide or methacrylamide, and
- (d) about 0.5-4% by weight of at least one alpha, beta-ethylenically unsaturated carboxylic acid selected from acrylic acid, methacrylic acid, and itaconic acid;
- (2) said second stage is formed by emulsion polymerization, in the presence of said first stage, of a second monomer composition having a T.sub.g of about (-)10 to (+)60.degree. C. consisting essentially of:
- (a) about 40-70% by weight of at least one (C.sub.1 -C.sub.8) alkyl acrylate,
- (b) about 20-50% by weight of at least one (C.sub.1 -C.sub.8) alkyl methacrylate,
- (c) about 4-10% by weight of a latent cross-linking monomer selected from acrylamide and methacrylamide, and
- (d) about 0.5-4% by weight of at least one alpha, beta-ethylenically unsaturated carboxylic acid selected from acrylic acid, methacrylic acid, an itaconic acid;
- and
- (3) said third stage is formed by emulsion polymerization, in the presence of said second stage polymerization product, of a third monomer composition consisting essentially of:
- (a) about 50-100% by weight of methyl methacrylate, and
- (b) about 0-50% by weight of a comonomer selected from those comonomers copolymerizable with methyl methacrylate and having a calculated T.sub.g of less than (-)25.degree. C.
Dependencies are inferred from the claim text.