Compatible mixtures of a polycarbonate and a methacrylate copolymer

• US 4,749,749 A
• Filed: 08/13/1987
• Issued: 06/07/1988
• Est. Priority Date: 09/27/1986
• Status: Expired due to Fees

• Current Assignee: Rohm GmbH Chemische Fabrik
• Original Assignee: Rohm GmbH Chemische Fabrik
• Inventors: Wunderlich, Winfried, Munzer, Manfred
• Primary Examiner(s): Pertilla, Theodore E.
• Application Number:
  US07/084,868
• Time in Patent Office: 299 Days
• Field of Search: 525/148, 525/146, 525/468, 526/305, 526/303.1
• US Class Current: 525/148
• CPC Class Codes: C08L 33/00 Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• CPC Class Codes: G11B 7/253 of substrates

Abstract

Transparent, thermoplastically processible polymer mixtures comprised of:

(A) Polycarbonates, particularly bisphenol A polycarbonates; and

(B) Copolymers of methyl methacrylate and monosubstituted (meth)acrylamides, the latter present in the amount of 5-25 wt. %, wherein the substituent on the amide nitrogen is a cyclic organic group having an aliphatic, aromatic, or heterocyclic structure, which has no appreciable absorption capability for visible light as far as the UV wavelength of 340 nm.

Claims

1. A transparent, thermoplastically processible polymer mixture, comprising:

(A) an aromatic polycarbonate; and

(B) a methacrylate copolymer;

wherein said methacrylate copolymer comprises

(i) 65-95 wt. % methyl methacrylate monomer units; and

(ii) 5-25 wt. % monosubstituted(meth)acrylamide monomer units having the formula ##STR5## wherein R is H or a methyl and X is a substituted or unsubstituted cycloaliphatic, aromatic or heterocylic organic group, wherein X has no appreciable absorption capability for visible light as far as the UV wavelength of 340 nm, and wherein said copolymer (B) has a molecular weight>

30,000.

2. The polymer mixture of claim 1, wherein said copolymer (B) further comprises up to 20 wt. % α

,β

-unsaturated monomer units.

3. The polymer mixture of claim 1, wherein X is a cyclohexyl group.

4. The polymer mixture of claim 3, wherein X is a methylcyclohexyl group.

5. The polymer mixture of claim 1, wherein X is a benzyl group.

6. The polymer mixture of claim 2, wherein said α

,β

-unsaturated monomer unit comprises a member selected from the group consisting of styrene, α

-methyl styrene, acrylic acid, and acrylic acid ester units.

7. The polymer mixture of claim 1, wherein said polycarbonate is bisphenol A polycarbonate.

8. The polymer mixture of claim 1, wherein said methacrylate copolymer has a molecular weight of about 30,000-200,000.

9. The polymer mixture of claim 8, wherein said methacrylate copolymer has a molecular weight of about 50,000-100,000.

10. A method of preparing an optically readable information storage unit, comprising molding said storage unit from the transparent, thermoplastically processable polymer mixture of claim 1.