Patent US4147707A successfully refreshed from Google Patents.
US4147707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass fiber-reinforced polycarbonates with improved mechanical properties containing 0.5 to 5.0% of organopolysiloxane
Assignee: Bayer AG
•
Filing: 1976-04-21
•
Granted: 1979-04-03
•
Expires: 1996-04-21
Abstract
Abstract Glass fiber reinforced polycarbonate molding compositions are taught which have improved mechanical properties. This improvement is achieved by incorporating between about 0.5 to 5 wt.% of organopolysiloxanes into the composition. The compositions of this invention have improved impact, notched impact and elongation properties without a loss in elastic modulus.
Inventors
- 👤 Wolfgang Alewelt
- 👤 Dieter Margotte
- 👤 Hugo Vernaleken
- 👤 Horst-Gunter Kassahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:19
CPC Classifications
C; C08; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08K3/00; C08K3/40; C08L; C08L69/00; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
104 words
Thermoplastic moulding compositions consisting of A. about 45-89.5% by weight of high molecular weight, thermoplastic polycarbonates based on diphenols having weight-average molecular weights, M w , between about 10,000 and 100,000, B. about 10-50% by weight of glass fibers, and C. about 0.5-5% by weight of organopolysiloxanes having a viscosity between about 5 and 300,000 cSt at 20° C. which are obtained by hydrolysis or cohydrolysis of the monomers ##STR4## in which R', which may be the same or different, is H, C 1 -C 6 alkyl or phenyl, and the sum of the percentages by weight of A+B+C being 100 in each case.
Claim 2
Dependent Claim
104 words
Thermoplastic moulding compositions consisting of A. about 45-89.5% by weight of high molecular weight, thermoplastic polycarbonates based on diphenols having weight-average molecular weights, M w , between about 10,000 and 100,000, B. about 10-50% by weight of glass fibers, and C. about 0.5-5% by weight of organopolysiloxanes having a viscosity between about 5 and 300,000 cSt at 20° C. which are obtained by hydrolysis or cohydrolysis of the monomers ##STR4## in which R', which may be the same or different, is H, C 1 -C 6 alkyl or phenyl, and the sum of the percentages by weight of A+B+C being 100 in each case.
Claim 3
Dependent Claim
36 words
Thermoplastic moulding compositions according to claim 1, consisting of A. about 45-79.5% by weight of high molecular weight, thermoplastic polycarbonates, B. about 20-50% by weight of glass fibers, and C. about 0.5-5% by weight of organopolysiloxanes.
References Cited (Backward Citations)
US3577378A
Cited
US3639331A
Cited
US3751519A
Cited
US3933730A
Cited
DE2535263A1
Cited
US3971756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |