Claims
- 1. A substantially transparent thermoplastic molding composition comprising
- (i) about 1 to 99 percent by weight of a polycarbonate resin, and
- (ii) about 1 to 99 percent by weight of a polyester copolymer of phthalic acid and a mixture of cyclohexanedimethanol and ethylene glycol and
- (iii) about 0.01 to 0.4 phr relative to the total weight of (i) and (ii) of a siloxane conforming structurally to ##STR6## where R.sub.1 is C.sub.1-4 alkyl or C.sub.6-14 aryl,
- R.sub.2 denotes (CH.sub.2).sub.m where m is an integer of 1 to 4,
- R.sub.3 is (CH.sub.2).sub.p where p is 1 to 4 and
- n is about 1 to 10,000
- said composition having a degree of resistance to degradation induced by exposure to gamma radiation greater than that of a corresponding composition which contains no siloxane, said cyclohexane dimethanol and said ethylene glycol being present in said polyester copolymer in a molar ratio of 1:1 to 4:1 therebetween.
- 2. The composition of claim 1 wherein said n is 2 to 30.
- 3. The composition of claim 1 wherein amount is about 0.01 to 0.25 phr relative to the total weight of (i) and (ii).
- 4. The composition of claim 1 wherein said siloxane conforms to ##STR7##
- 5. The composition of claim 4 wherein amount is about 0.01 to 0.25 phr relative to the total weight of (i) and (ii).
Parent Case Info
This application is a continuation of application Ser. No. 08/343,799 filed Nov. 22, 1994, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (2)
Number |
Date |
Country |
505869 |
Sep 1992 |
EPX |
148560 |
Jul 1987 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
343799 |
Nov 1994 |
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