USRE31165E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent moulding composition of a polycarbonate and a resin
Assignee: Bayer AG
•
Filing: 1981-09-21
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Granted: 1983-03-01
•
Expires: 2001-09-21
Abstract
Abstract A transparent moulding composition comprising a bisphenol polycarbonate having a low refractive index due to a content of alkyl substitution and a rubber and/or a resin.
Inventors
- 👤 Volker Serini
- 👤 Gert Humme
- 👤 Karl-Heinz Ott
- 👤 Wolfgang Cohnen
- 👤 Hugo Vernaleken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:10
CPC Classifications
C; C08; C08L; C08L21/00; C08L51/00; C08L51/04; C08L69/00; C08L2201/00; C08L2201/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
161 words
A transparent moulding compound which comprises a. 10 to 95% by weight of a transparent aromatic polycarbonate.Iadd., .Iaddend.the linear chains of which consist .[.to.]. .Iadd.of .Iaddend.at least 50% of recurrent structural units of .Iadd.the .Iaddend.formula .[.(1).]. ##STR3## in which R 1 to R 8 , which may be the same or different, represent hydrogen or alkyl .Iadd.with the proviso that at least one of the R 1 to R 8 substitutents is an alkyl group .Iaddend.and X represents a single bond, a C 1 to C 12 alkylene or alkylidene group or ##STR4## .[.if at least one of the R 1 to R 8 substituents is an alkyl group or represents a C 6 to C 12 alkylene or alkylidene group if R 1 to R 8 is hydrogen.]. and b. 5 to 90% by weight of a transparent rubber and/or a transparent resin which contains rubber, the difference in refractive indices between (a) and (b) being not more than 0.010.
Claim 2
Dependent Claim
161 words
A transparent moulding compound which comprises a. 10 to 95% by weight of a transparent aromatic polycarbonate.Iadd., .Iaddend.the linear chains of which consist .[.to.]. .Iadd.of .Iaddend.at least 50% of recurrent structural units of .Iadd.the .Iaddend.formula .[.(1).]. ##STR3## in which R 1 to R 8 , which may be the same or different, represent hydrogen or alkyl .Iadd.with the proviso that at least one of the R 1 to R 8 substitutents is an alkyl group .Iaddend.and X represents a single bond, a C 1 to C 12 alkylene or alkylidene group or ##STR4## .[.if at least one of the R 1 to R 8 substituents is an alkyl group or represents a C 6 to C 12 alkylene or alkylidene group if R 1 to R 8 is hydrogen.]. and b. 5 to 90% by weight of a transparent rubber and/or a transparent resin which contains rubber, the difference in refractive indices between (a) and (b) being not more than 0.010.
Claim 3
Dependent Claim
34 words
A moulding compound as claimed in claim 1 in which, in the general formula (1) of claim 1, R 1 to R 8 represents hydrogen or a C 1 to C 5 alkyl group.
Claim 4
Dependent Claim
55 words
A moulding compound as claimed in claim 1, in which in the general formula (1), R 1 , R 2 , R 7 and R 8 represent C 1 -C 3 alkyl, R 3 , R 4 , R 5 and R 6 represent H, and X represents C 1 -C 12 alkylene or alkylidene.
Claim 5
Dependent Claim
23 words
A moulding compound as claimed in claim 1, in which the structural units of the formula (1) are based on 2,4-bis-(3,5-dimethyl-4-hydroxyphenyl)-2-methylbutane or 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane.
Claim 6
Dependent Claim
27 words
A moulding compound as claimed in claim 1, in which the polycarbonate (a) contains up to 50% of structural units based on bis-(4-hydroxyphenyl)-methane; 2,2-bis-(4-hydroxyphenyl)-propane; 2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane or α,α'-bis-(4-hydroxyphenyl)-p.diisopropylbenzene.
Claim 7
Dependent Claim
24 words
A moulding compound as claimed in claim 1, in which the polycarbonate (a) is branched by the incorporation of small quantities of polyhydroxyl compound.
Claim 8
Dependent Claim
22 words
A moulding compound as claimed in claim 6 in which the polycarbonate contains from 0.05 to 2.0 mols percent of polyhydroxyl compound.
Claim 9
Dependent Claim
22 words
A moulding compound as claimed in claim 1, in which the polycarbonate (a) has a molecular weight of from 10,000 to 200,00.
Claim 10
Dependent Claim
22 words
A moulding compound as claimed in claim 8, in which the polycarbonate (a) has a molecular weight of from 20,000 to 60,000.
Claim 11
Dependent Claim
22 words
A moulding compound as claimed in claim 1, in which the rubber (b) has a refractive index of n D 20 >1.50.
Claim 12
Dependent Claim
28 words
A moulding compound as claimed in claim 1, in which the rubber is polybutadiene, polyisoprene, a copolymer of butadiene or isoprene with styrene and/or acrylonitrile or a transpolypentenamer.
Claim 13
Dependent Claim
64 words
A moulding compound as claimed in claim 1, in which the component (b) is a transparent graft polymer into which rubber has been mixed, a transparent mixture of a graft polymer, a thermoplastic resin and rubber or a transparent mixture of a thermoplastic resin and rubber, said thermoplastic resin being a homopolymer or copolymer of styrene, α-methylstyrene, acrylonitrile, methacrylonitrile, methylacrylate, methylmethacrylate, ethylacrylate or ethylmethacrylate.
Claim 14
Dependent Claim
47 words
A moulding compound as claimed in claim 1, in which the component (b) is a transparent graft polymer or transparent mixture of a graft polymer and a thermoplastic resin, said thermoplastic resin being a homopolymer or copolymer of styrene, α-methylstyrene, acrylonitrile, methacrylonitrile, methylacrylate, methylmethacrylate, ethylacrylate or ethylmethacrylate.
Claim 15
Dependent Claim
21 words
A moulding compound as claimed in claim 1, in which the total rubber content is between 5 and 40% by weight.
Claim 16
Dependent Claim
36 words
A moulding compound as claimed in claim 12 in which the graft polymer is obtained by grafting one or several of the monomers styrene, α-methylstyrene, acrylonitrile, methacrylonitrile, methylacrylate, methylacrylate, ethylacrylate and ethylmethacrylate onto a diene rubber.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |