US3880783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent moulding composition of a polycarbonate and a resin
Assignee: Bayer AG
•
Filing: 1973-12-03
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Granted: 1975-04-29
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Expires: 1993-12-03
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
2026-10-27 11:19
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
35 words
A TRANSPARENT MOULDING COMPOUND WHICH COMPRISES A. 10 TO 95 % BY WEIGHT OF A TRANSPARENT AROMATIC POLYCARBONATE THE LINEAR CHAINS OF WHICH CONSIST TO AT LEAST 50% OF RECURRENT STRUCTURAL UNITS OF FORMULA (1)
Claim 2
Dependent Claim
35 words
A TRANSPARENT MOULDING COMPOUND WHICH COMPRISES A. 10 TO 95 % BY WEIGHT OF A TRANSPARENT AROMATIC POLYCARBONATE THE LINEAR CHAINS OF WHICH CONSIST TO AT LEAST 50% OF RECURRENT STRUCTURAL UNITS OF FORMULA (1)
Claim 3
Dependent Claim
30 words
A moulding compound as claimed in claim 1 in which, in the general formula (1) of claim 1, R1 to R8 represents hydrogen or a C1 to C5 alkyl group.
Claim 4
Dependent Claim
41 words
A moulding compound as claimed in claim 1, in which in the general formula (1), R1, R2, R7 and R8 represent C1 - C3 alkyl, R3, R4, R5 and R6 represent H, and X represents C1 - C12 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
31 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 Alpha , Alpha ''-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
23 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
23 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
21 words
A moulding compound as claimed in claim 1, in which the rubber (b) has a refractive index of nD20 > 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
65 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, Alpha -methylstyrene, acrylonitrile, methacrylonitrile, methylacrylate, methylmethacrylate, ethylacrylate or ethylmethacrylate.
Claim 14
Dependent Claim
48 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, Alpha -methylstyrene, acrylonitrile, methacrylonitrile, methylacrylate, methylmethaCrylate, ethylacrylate or ethylmethacrylate.
Claim 15
Dependent Claim
22 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
37 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, Alpha -methylstyrene, acrylonitrile, methacrylonitrile, methylacrylate, methylacrylate, ethylacrylate and ethylmethacrylate onto a diene rubber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |