Multi-layer structure polymer composition
First Claim
1. A multi-layer structure polymer composition having the following layers as fundamental structural units;
- (a) an innermost layer polymer (A) comprising 50-100 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (A1), 0-50 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (A2), provided that the total of (A1) and (A2) is 80-100 parts by weight, 0-20 parts by weight of a monomer having a copolymerizable double bond (A3), 0-10 parts by weight of a polyfunctional monomer (A4), provided that the total of (A1), (A2), (A3) and (A4) is 100 parts by weight, and 0.1-5 parts by weight, per 100 parts by weight of the total of (A1) to (A4), of a graft linking agent (A5) and having a glass transition temperature of lower than 10°
C., and a degree of swelling of from 2-10;
(b) a crosslinked elastic polymer (B) comprising 80-100 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (B1), 0-20 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (B2), 0-20 parts by weight of a monomer having a copolymerizable double bond (B3), 0-10 parts by weight of a polyfunctional monomer (B4), provided that the total of (B1), (B2) and (B3) and (B4) is 100 parts by weight, and 0.1-5 parts by weight, per 100 parts by weight of the total of (B1) to (B4), of a graft linking agent (B5) and having a glass transition temperature of 0°
C. or lower and a degree of swelling of from 3-15, with the proviso that the degree of swelling of layer B is higher than that of said innermost layer polymer (A);
(c) an outermost layer polymer (C) comprising 51-100 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (C2), 0-29 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (C1) and 0-20 parts by weight of a monomer having a copolymerizable double bond (C3), provided that the total of (C1), (C2) and (C3) is 100 parts by weight, and having a glass transition temperature of 60°
C. or higher; and
(d) at least one intermediate layer (D) between said polymer (B) layer and said polymer (C) layer comprising 10-90 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (D1), 90-10 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (D2), 0-20 parts by weight of a monomer having a copolymerizable double bond (D3), 0-10 parts by weight of a polyfunctional monomer (D4), provided that the total of (D1), (D2), (D3) and (D4) is 100 parts by weight, and 0.15 parts by weight, based on a total of (D1) to (D4), of a graft linking agent (D5), wherein the amount of alkyl acrylate in said intermediate layer (D) linearly decreases from the crosslinked elastic polymer (B) to the outermost layer polymer (C), and wherein the gel content of said multi-layer structural polymer composition is at least 50%.
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Abstract
A multi-layer structure polymer composition having a gel content of at least 50% which is constituted of an innermost layer polymer (A) consisting mainly of alkyl acrylate and having a degree of swelling of 10 or lower, and having a glass transition temperature lower than 10° C., a crosslinked elastomer polymer (B) consisting mainly of alkyl acrylate and having a degree of swelling slightly higher than that of said polymer (A) and having a glass transition temperature not higher than 0° C., said innermost layer polymer (A) and said crosslinked elastomer polymer (B) constituting a double layer elastomer structure polymer, as well as an outermost layer polymer (C) consisting mainly of alkyl methacrylate and having a glass transition temperature not lower than 60° C., and at least one intermediate layer (D) existing between said polymer (B) layer and said polymer (C) layer, the amount of alkyl acrylate in said intermediate layer (D) linearly decreasing from said polymer (B) layer to said polymer (C) layer. Said polymer composition does not readily show the phenomenon of whitening even if dipped in hot water or boiling water and is excellent in weather resistance, solvent resistance, stress-whitening resistance, water-whitening resistance and transparency.
26 Citations
20 Claims
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1. A multi-layer structure polymer composition having the following layers as fundamental structural units;
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(a) an innermost layer polymer (A) comprising 50-100 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (A1), 0-50 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (A2), provided that the total of (A1) and (A2) is 80-100 parts by weight, 0-20 parts by weight of a monomer having a copolymerizable double bond (A3), 0-10 parts by weight of a polyfunctional monomer (A4), provided that the total of (A1), (A2), (A3) and (A4) is 100 parts by weight, and 0.1-5 parts by weight, per 100 parts by weight of the total of (A1) to (A4), of a graft linking agent (A5) and having a glass transition temperature of lower than 10°
C., and a degree of swelling of from 2-10;(b) a crosslinked elastic polymer (B) comprising 80-100 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (B1), 0-20 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (B2), 0-20 parts by weight of a monomer having a copolymerizable double bond (B3), 0-10 parts by weight of a polyfunctional monomer (B4), provided that the total of (B1), (B2) and (B3) and (B4) is 100 parts by weight, and 0.1-5 parts by weight, per 100 parts by weight of the total of (B1) to (B4), of a graft linking agent (B5) and having a glass transition temperature of 0°
C. or lower and a degree of swelling of from 3-15, with the proviso that the degree of swelling of layer B is higher than that of said innermost layer polymer (A);(c) an outermost layer polymer (C) comprising 51-100 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (C2), 0-29 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (C1) and 0-20 parts by weight of a monomer having a copolymerizable double bond (C3), provided that the total of (C1), (C2) and (C3) is 100 parts by weight, and having a glass transition temperature of 60°
C. or higher; and(d) at least one intermediate layer (D) between said polymer (B) layer and said polymer (C) layer comprising 10-90 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (D1), 90-10 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (D2), 0-20 parts by weight of a monomer having a copolymerizable double bond (D3), 0-10 parts by weight of a polyfunctional monomer (D4), provided that the total of (D1), (D2), (D3) and (D4) is 100 parts by weight, and 0.15 parts by weight, based on a total of (D1) to (D4), of a graft linking agent (D5), wherein the amount of alkyl acrylate in said intermediate layer (D) linearly decreases from the crosslinked elastic polymer (B) to the outermost layer polymer (C), and wherein the gel content of said multi-layer structural polymer composition is at least 50%. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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3. A multi-layer structure polymer composition having the following layers as fundamental structure units:
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(a) an innermost layer polymer (A) comprising 50-90 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (A1), 1-50 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (A2) provided that the total of (A1) and (A2) is 80-100 parts by weight, 0-19 parts by weight of a monomer having a copolymerizable double bond (A3), 1-10 parts by weight of a polyfunctional monomer (A4), provided that the total of (A1), (A2), (A3) and (A4) is 100 parts by weight, and 0.1-5 parts by weight, per 100 parts by weight of the total of (A1) to (A4), of a graph linking agent (A5) and having a glass transition temperature of lower than 10°
C., a gel content of 80% by weight or higher, and a degree of swelling of from 2-10;(b) a crosslinked elastic polymer (B) comprising 90-100 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (B1), 0-10 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (B2), 0-20 parts by weight of a monomer having a copolymerizable double bond (B3), 0-10 parts by weight of a polyfunctional monomer (B4), provided that the total of (B1), (B2), (B3) and (B4) is 100 parts by weight, and 0.1-5 parts by weight, per 100 parts by weight of the total of (B1) to (B4), of the graft linking agent (B5) and having a glass transition temperature of 0°
C. or lower and a degree of swelling of from 3-15, with the proviso that the degree of swelling of layer (B) is a higher than that of said innermost layer polymer (A);(c) an outermost layer polymer (C) comprising 75-100 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (C2), 0-25 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (C1) and 0-20 parts by weight of a monomer having a copolymerizable double bond (C3), provided that the total of (C1), (C2) and (C3) is 100 parts by weight, and having a glass transition temperature of 60°
C. or higher; and(d) at least one intermediate layer (D) between said polymer (B) layer and said polymer (C) layer comprising 30-70 parts by weight of an alkyl acrylate having a C1 -C8 alkyl group (D1), 70-30 parts by weight of an alkyl methacrylate having a C1 -C4 alkyl group (D2), 0-20 parts by weight of a monomer having a copolymerizable double bond (D3), 0-10 parts by weight of a polyfunctional monomer (D4), provided that the total of (D1), (D2), (D3) and (D4) is 100 parts by weight, and 0.1-5 parts by weight, based on the total of (D1) to (D4) of a graft linking agent (D5), wherein the amount of alkyl acrylate in said intermediate layer (D) linearly decreases from the crosslinked elastic polymer (B) to the outermost layer polymer (C), and wherein the gel content of said multi-layer structural polymer composition is at least 50%. - View Dependent Claims (4)
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Specification