Transparent, thermoplastically processable polymer blends made of an aromatic polycarbonate and a methyacrylate polymer
AssigneeRohm GmbH Chemische Fabrik
InventorsJens-Dieter Fischer, Werner Siol
Life of this patent
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Abstract
Transparent, thermoplastically processable polymer blends of (A) polycarbonates, especially Bisphenol A polycarbonates, and (B) methyacrylate copolymers are disclosed. They are prepared from 95 to 5 wt. % methyl methacrylate and 5 to 95 wt. % methacrylic esters and optionally 0 to 30 wt. % especially 1 to 25 wt. % of an acrylic ester with carbocyclic groups in the ester group, and which can also contain other polymer building blocks in amounts of 0 to 40 wt. % formed from .alpha.,.beta.-unsaturated monomers.
Claims11
A transparent, monophasic thermoplastically processable polymer blend consisting essentially of (A) an aromatic polycarbonate and (B) a methacrylate copolymer, wherein said copolymer (B) comprises:
- (i) 95 to 5 wt. % of methacrylate units;
- and
- (ii) 5 to 95 wt. % of (iia) at least one methacrylic ester unit having a carbocyclic group in the ester group and (iib) 0 to 30 wt. % of an acrylic ester unit having a carbocyclic group in the ester group, wherein the units of (iia) and (iib) have a structure of formula (I):
- H.sub.2 C.dbd.C(R.sub.1)--CO--0--X
- wherein:
- R.sub.1 is H or CH.sub.3 ;
- and
- X is Y or A-Y;
- wherein Y is a C.sub.5-12 cycloalkyl group, an alkyl-substituted cycloalkyl group containing a total of 5 to 12 carbon atoms, a polyalkyl-substituted cycloalkyl group containing a total of 5 to 12 carbon atoms, a C.sub.6-12 aryl group, an alkyl-substituted aryl group containing a total of 6 to 12 carbon atoms, or an oxyalkyl-substituted aryl group containing a total of 6 to 12 carbon atoms;
- and A is a linear C.sub.1-6 alkylene group, a C.sub.2-6 branched alkylene group, or a linear C.sub.2-4 oxyalkylene group or a branched C.sub.2-4 oxyalkylene group;
- (iii) wherein said copolymer (B) has an average molecular weight, W.sub.w, of about 30,000 determined by gel permeation chromatography.
An optical article obtained from a transparent monophasic, thermoplastically processable polymer blend consisting essentially of (A) an aromatic polycarbonate and (B) a methacrylate copolymer, wherein said copolymer (B) comprises:
- (i) 95 to 5 wt. % of methyl methacrylate units;
- (ii) 5 to 95 wt. % of (iia) at least one methacrylic ester unit having a carbocyclic group in the ester group and (iib) 0 to 30 wt. % of an acrylic ester unit having a carbocyclic group in the ester group, wherein the units of (iia) and (iib) have a structure of formula (I):
- H.sub.2 C.dbd.C(R.sub.1)--CO--O--X
- wherein:
- R.sub.1 is H or CH.sub.3;
- and
- X is Y or A-Y;
- wherein Y is a C.sub.5-12 cycloalkyl group, a monoalkyl-substituted cycloalkyl group containing a total of 5 to 12 carbon atoms, a polyalkyl-substituted cyclo-alkyl group containing a total of 5 to 12 carbon atoms, a C.sub.6-12 aryl group, an alkyl-substituted aryl group containing a total of 6 to 12 carbon atoms, or an oxyalkyl-substituted aryl group containing a total of 6 to 12 carbon atoms;
- and A is a linear C.sub.1-6 alkylene group, a branched C.sub.2-6 alkylene group, a linear C.sub.2-4 oxyalkylene group or a branched C.sub.2-4 oxyalkylene group;
- and
- (iii) wherein said copolymer (B) has an average molecular weight, Mw, of above 30,000 determined by gel permeation chromotography.
Dependencies are inferred from the claim text.