Patent US4070330A successfully refreshed from Google Patents.
US4070330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High impact mineral filled polycarbonates
Assignee: Bayer Corp
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Filing: 1976-01-23
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Granted: 1978-01-24
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Expires: 1996-01-23
Abstract
Abstract High impact mineral filled polycarbonates are comprised of a polycarbonate resin of a novaculite mineral filler having an average particle size of less than 5 microns. The percentage of novaculite is based on the total weight of the polycarbonate resin and novaculite. The polycarbonate articles formed from the mineral filled blends exhibit excellent impact properties over typical fillers for polycarbonate resin. Impact properties of the polycarbonate can be further improved by the addition of a silane coupling agent to the polycarbonate novaculite blend.
Inventors
- 👤 Herbert L. Rawlings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:45
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
34 words
In a polycarbonate suitable for forming molded articles comprising a polycarbonate resin and a filler the improvement comprising said filler being a novaculite mineral having an average particle size of up to 5 microns.
Claim 2
Dependent Claim
34 words
In a polycarbonate suitable for forming molded articles comprising a polycarbonate resin and a filler the improvement comprising said filler being a novaculite mineral having an average particle size of up to 5 microns.
Claim 3
Dependent Claim
29 words
The polycarbonate of claim 1 wherein said novaculite is present from 5 to 30 percent by weight based on the combined weight of said polycarbonate resin and said novaculite.
Claim 4
Dependent Claim
17 words
The polycarbonate of claim 1 wherein said novaculite has a particle size of less than 10 microns.
Claim 5
Dependent Claim
11 words
The polycarbonate of claim 2 which includes a silane coupling agent.
Claim 6
Dependent Claim
29 words
The polycarbonate of claim 4 wherein said silane coupling agent is present at a level of up to 2 percent by weight based on the weight of said novaculite.
Claim 7
Dependent Claim
15 words
The polycarbonate of claim 4 wherein said coupling agent is a glycidoxypropyltrimethoxy silane coupling agent.
Claim 8
Dependent Claim
25 words
A polycarbonate comprising: a polycarbonate resin capable of being molded; and, a novaculite mineral filler having an average particle size of 3 to 5 microns.
Claim 9
Dependent Claim
25 words
A polycarbonate comprising: a polycarbonate resin capable of being molded; and, a novaculite mineral filler having an average particle size of 3 to 5 microns.
Claim 10
Dependent Claim
20 words
The polycarbonate of claim 7 wherein said polycarbonate resin is comprised of the reaction product of bisphenol A and phosgene.
Claim 11
Dependent Claim
26 words
The polycarbonate of claim 7 wherein said novaculite is present from 5 to 30 percent based on the combined weight of said polycarbonate and said novaculite.
Claim 12
Dependent Claim
16 words
The polycarbonate of claim 7 wherein said novaculite has a particle size of less than 10μ.
Claim 13
Dependent Claim
11 words
The polycarbonate of claim 7 which includes a silane coupling agent.
Claim 14
Dependent Claim
29 words
The polycarbonate of claim 11 wherein said silane coupling agent is present at a level of up to 2 percent by weight based on the weight of said novaculite.
Claim 15
Dependent Claim
15 words
The polycarbonate of claim 12 wherein said coupling agent is a 3,4-epoxycyclohexyl-ethyltrimethoxy silane coupling agent.
Claim 16
Dependent Claim
15 words
The polycarbonate of claim 4, wherein said coupling agent is a 3,4-epoxycyclohexyl-ethyltrimethoxy silane coupling agent.
Claim 17
Dependent Claim
15 words
The polycarbonate of claim 12, wherein said coupling agent is a glycidoxypropyltrimethoxy silane coupling agent.
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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |