US3962157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene composition modified with porous filler and a radical generating agent
Assignee: Mitsubishi Chemical Corp
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Filing: 1974-08-26
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Granted: 1976-06-08
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Expires: 1994-08-26
Abstract
Abstract A modified polyolefin composition having excellent physical properties such as bending rigidity, bending strength, impact strength, and the like can be prepared by melting and kneading a mixture of a radical generating agent such as benzoyl peroxide, a porous filler, and a polyolefin composed primarily of propylene and, if necessary, a polar vinyl monomer at a high temperature above the decomposition temperature of the radical generating agent.
Inventors
- 👤 Seikou Nakano
- 👤 Yukitaka Goto
- 👤 Takayuki Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:30
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08K; C08K5/00; C08K5/04; C08K5/14; C08L1/00; C08L1/02; C08L23/12; C08L51/00; C08L51/06; C08L97/00; C08L97/02; C08L23/04; C08L23/06; C08L23/14; C08L23/142
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
A process for preparing a modified polyolefin composition for shaping use which comprises adding a radical generating agent in a quantity of not greater than 5% by weight to 10 to 80% by weight of a porous filler having a particle size not greater than 5 mesh and 90 to 20% by weight of a polyolefin selected from the group consisting of propylene homopolymer and ethylene-propylene copolymers with an ethylene content not greater than 15%, all of said quantities of these materials being based on the total weight of the polyolefin, porous filler and radical generating agent, and kneading the resulting mixture at a high temperature above the decomposition temperature of the radical generating agent and the melting temperature of the polyolefin.
Claim 2
Dependent Claim
122 words
A process for preparing a modified polyolefin composition for shaping use which comprises adding a radical generating agent in a quantity of not greater than 5% by weight to 10 to 80% by weight of a porous filler having a particle size not greater than 5 mesh and 90 to 20% by weight of a polyolefin selected from the group consisting of propylene homopolymer and ethylene-propylene copolymers with an ethylene content not greater than 15%, all of said quantities of these materials being based on the total weight of the polyolefin, porous filler and radical generating agent, and kneading the resulting mixture at a high temperature above the decomposition temperature of the radical generating agent and the melting temperature of the polyolefin.
Claim 3
Dependent Claim
14 words
The process, according to claim 1, wherein the porous filler is a cellulosic powder.
Claim 4
Dependent Claim
13 words
The process according to claim 2 wherein the cellulosic powder is wood powder.
Claim 5
Dependent Claim
15 words
The process according to claim 1 wherein the radical generating agent is an organic peroxide.
Claim 6
Dependent Claim
44 words
The process according to claim 3 wherein the quantity of the wood powder is 20 to 60% by weight, and the quantity of the polyolefin is 40 to 80% by weight based on the total weight of polyolefin, cellulosic powder, and radical generating agent.
Claim 7
Dependent Claim
24 words
The process according to claim 1 wherein the wood powder has a particle size of not greater than 80 mesh by Tyler standard sieve.
Claim 8
Dependent Claim
50 words
The process according to claim 1 wherein the melting and kneading of the mixture takes place in the presence of a polar vinyl monomer in a quantity of 0.01 to 15% by weight based on the total weight of the polyolefin, porous filler, radical generating agent, and polar vinyl monomer.
Claim 9
Dependent Claim
33 words
The composition according to claim 7 wherein the polar vinyl monomer is selected from the group consisting of acrylic acid and esters thereof, N-methylacrylamide, vinyl chloride, maleic anhydride, itaconic anhydride, and glycidyl methacrylate.
Claim 10
Dependent Claim
14 words
The process according to claim 7 wherein the polar vinyl monomer is maleic anhydride.
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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |