Patent EP-0096412-A2 (EP)
Inventor: KISHIDA KAZUO
IPC: C08F265/06
Filed: 1983-06-06
Abstract: A Novel acrylic thermoplastic resin composition transparent and excellent in flexibility consisting of from 1 through 99 parts by weight of at least one multi-layer structure polymer [I] and from 99 through 1 part by weight of at least one multi-layer structure polymer [II], said polymer [I] and polymer (II] having the following structures:Multi-layer structure polymer [I]: A multilayer structure polymer comprising the following (A) and (B):(A) an inner layer polymer (A) constituted of from 60 through 100 parts by weight of an alkyl acrylate having C<sub>1</sub>-C<sub>S</sub> alkyl group (A,), from 0 through 40 parts by weight of a monomer having copolymerizable double bond (A<sub>2</sub>), from 0 through 10 parts by weight of a polyfunctional monomer (A3) and from 0.1 through 5 parts by weight, per 100 parts by weight of the sum of (A,) to (A3), of a grafting agent, wherein gel content of said inner layer polymer (A) is 60% by weight or higher and its proportion to said polymer [I] is from 5% by weight through 46% by weight;(B) an outer layer polymer (B) constituted of from 60 through 100 parts by weight of an alkyl methacrylate having C<sub>1</sub>-C<sub>4</sub> alkyl group (B,) and from 0 through 40 parts by weight of a monomer having copolymerizable double bond (B<sub>2</sub>), wherein the proportion of said outer layer polymer (B) to said polymer [I] is from 54% by weight through 95% by weight, and which optionally has the following layer (C) between layer (A) and layer (B):(C): at least one intermediate layer (C) which is a polymer constituted of from 10 through 90 parts by weight of an alkyl methacrylate having C<sub>l</sub>-C<sub>4</sub> alkyl group (C<sub>1</sub>), from 10 through 90 parts by weight of an alkyl acrylate having C<sub>1</sub>-C<sub>8</sub> alkyl group (C<sub>2</sub>), from 0 through 20 parts by weight of a monomer having copolymerizable double bond (C<sub>3</sub>), from 0 through 10% by weight of a polyfunctional monomer (C<sub>4</sub>) and from 0.1 through 5 parts by weight, per 100 parts by weight of the sum of (C<sub>1</sub>) to (C<sub>4</sub>), of a grafting agent, wherein the proportion of said intermediate layer (C) to said polymer [I] is from 5 through 35% by weight;Multi-layer structure polymer [II]: A multi-layer structure polymer comprising the following (A') and (B'):(A') an inner layer polymer (A') constituted of from 60 through 100 parts by weight of an alkyl acrylate having C<sub>1</sub>-C<sub>8</sub> alkyl group (A<sub>1</sub>'), from 0 through 40 parts by weight of a monomer having copolymerizable double bond (A<sub>2</sub>'), from 0 through 10 parts by weight of a polyfunctional monomer (A<sub>3</sub>') and from 0.1 through 5 parts by weight, per 100 parts by weight of the sum of (A<sub>1</sub>') to (A<sub>3</sub>'), of a grafting agent, wherein gel content of said inner layer polymer (A') is 60% by weight or higher and its proportion to said polymer [II] is larger than 46% by weight and not larger than 90% by weight;(B') an outer layer polymer (B') constituted of from 60 through 100 parts by weight of an alkyl methacrylate having C<sub>1</sub>-C<sub>4</sub> alkyl group (B<sub>1</sub>') and from 0 through 40 parts by weight of a monomer having copolymerizable double bond (B<sub>2</sub>'), wherein the proportion of said outer layer polymer (B') to said polymer [II] is lower than 54% by weight and not lower than 10% by weight, and which optionally has the following layer (C') between layer (A') and layer (B'):(C') at least one intermediate layer (C') which is a polymer constituted of from 10 through 90 parts by weight of an alkyl methacrylate having C<sub>l</sub>-C<sub>4</sub> alkyl group (C<sub>1</sub>'), from 10 through 90 parts by weight of an alkyl acrylate having C<sub>1</sub>-C<sub>8</sub> alkyl group (C<sub>2</sub>'), from 0 through 20 parts by weight of a monomer having copolymerizable double bond (C<sub>3</sub>'), from 0 through 10 parts by weight of a polyfunctional monomer (C4') and from 0.1 through 5 parts by weight, per 100 parts by weight of the sum of (C<sub>1</sub>') to (C<sub>4</sub>'), of a grafting agent, wherein the proportion of said intermediate layer (C') to said polymer [II] is from 5% by weight through 35% by weight.