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Patent US4094854A successfully refreshed from Google Patents.
US4094854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefin composition
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1977-03-24
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Granted: 1978-06-13
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Expires: 1997-03-24
Abstract
Abstract Polyolefin compositions comprising (I) crystalline polyolefin and (II) a mixture of inorganic fillers 5 to 45% by weight based on the total weight of said polyolefin and mixture, said mixture comprising (1) 40 to 95% by weight of a powder of a mixture of predominant calcium metasilicate and 0.2 to 20% by weight of calcium carbonate, said powder being in the long and narrow shape and more than 98% by weight thereof being passable through a 200-mesh Tyler's standard sieve, and (2) 60 to 5% by weight of hydrated magneium silicate powder which is passable through a 325-mesh Tyler's standard sieve.
Inventors
- 👤 Taro Harada
- 👤 Taisuke Okita
- 👤 Takahisa Hara
- 👤 Yuji Ikezawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:20
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
A polyolefin composition comprising (I) a crystalline polyolefin and (II) 5 to 45% by weight of a mixture of inorganic fillers based on the total weight of said polyolefin and said inorganic filler mixture, said mixture comprising (1) 40 to 95% of a powder mixture consisting essentially of calcium metasilicate and 0.2 to 20% by weight of calcium carbonate, said powder being in the long and narrow shape and more than 98% by weight thereof being passable through a 200-mesh Tyler's standard sieve and (2) 60 to 5% by weight of hydrated magnesium silicate powder which is passable through a 325-mesh Tyler's standard sieve.
Claim 2
Dependent Claim
104 words
A polyolefin composition comprising (I) a crystalline polyolefin and (II) 5 to 45% by weight of a mixture of inorganic fillers based on the total weight of said polyolefin and said inorganic filler mixture, said mixture comprising (1) 40 to 95% of a powder mixture consisting essentially of calcium metasilicate and 0.2 to 20% by weight of calcium carbonate, said powder being in the long and narrow shape and more than 98% by weight thereof being passable through a 200-mesh Tyler's standard sieve and (2) 60 to 5% by weight of hydrated magnesium silicate powder which is passable through a 325-mesh Tyler's standard sieve.
Claim 3
Dependent Claim
18 words
A polyolefin composition according to claim 1, wherein said crystalline polyolefin is a high-density polyethylene or crystalline poylpropylene.
Claim 4
Dependent Claim
23 words
A polyolefin composition according to claim 1, wherein said polypropylene is an isotactic propylene homopolymer or crystalline copolymer or propylene and other α-olefins.
Claim 5
Dependent Claim
41 words
A polyolefin composition according to claim 1, wherein the amount of said mixture of inorganic fillers to be added to said crystalline polyolefin is 10 to 30% by weight based on the total weight of said crystalline polyolefin and inorganic fillers.
Claim 6
Dependent Claim
25 words
A polyolefin composition according to claim 1, wherein said inorganic filler (1) is pulverized wollastonite which has been passed through a 200-mesh Tyler's standard sieve.
Claim 7
Dependent Claim
25 words
A polyolefin composition according to claim 1, wherein said inorganic filler (2) is pulverized talc which has been passed through a 325-mesh Tyler's standard sieve.
References Cited (Backward Citations)
US3157614A
Cited
US3457216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |