Patent US4504653A successfully refreshed from Google Patents.
US4504653A
Expired / Lapsed
US
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Process for producing polyolefin resin particles
Assignee: JSP Corp
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Filing: 1983-05-25
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Granted: 1985-03-12
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Expires: 2003-05-25
Abstract
Abstract A process for producing particles having an increased particle diameter from a powder of a polyolefin resin, which comprises heating the polyolefin resin powder at a temperature higher than the melting point of the resin in a dispersion medium in the presence of a dispersing agent and a surface-active agent.
Inventors
- 👤 Hideki Kuwabara
- 👤 Shohei Yoshimura
- 👤 Toru Yamaguchi
- 👤 Yoshimi Sudo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:38
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/12; C08J2323/00; C08J2323/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
51 words
A process for producing particles having an increased particle diameter from a powder of a polyolefin resin, which comprises heating the polyolefin resin powder at a temperature higher than the melting point of the resin in a dispersion medium in the presence of an inorganic dispersing agent and a surface-active agent.
Claim 2
Dependent Claim
51 words
A process for producing particles having an increased particle diameter from a powder of a polyolefin resin, which comprises heating the polyolefin resin powder at a temperature higher than the melting point of the resin in a dispersion medium in the presence of an inorganic dispersing agent and a surface-active agent.
Claim 3
Dependent Claim
51 words
The process of claim 1 wherein the polyolefin resin is selected from the group consisting of homopolymers of C 2 -C 5 olefins, copolymers of at least two C 2 -C 5 olefins with each other, and copolymers of C 2 -C 5 olefins in a major proportion with other comonomers.
Claim 4
Dependent Claim
43 words
The process of claim 1 wherein the polyolefin resin is selected from the group consisting of low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, polybutene, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-pentene copolymer, propylene-butene copolymer, propylene-pentene copolymer, ethylene-butadiene copolymer, propylene-styrene copolymer and ethylene-vinyl acetate copolymer.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the polyolefin resin has a melt index of 0.1 to 15.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the polyolefin resin powder has an average particle diameter of not more than 2 mm.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein the dispersing agent is selected from the group consisting of magnesium carbonate, talc, aluminum oxide, zinc oxide and zinc carbonate.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the dispersing agent has an average particle diameter of not more than 10 microns.
Claim 9
Dependent Claim
30 words
The process of claim 1 wherein the dispersing agent is used in an amount of 0.04 to 5 parts by weight per 100 parts by weight of the polyolefin resin.
Claim 10
Dependent Claim
26 words
The process of claim 1 wherein the surface-active agent is selected from the group consisting of anionic surface-active agents, cationic surface-active agents and amphoteric surface-active agents.
Claim 11
Dependent Claim
16 words
The process of claim 1 wherein the surface-active agent is a metal salt of stearic acid.
Claim 12
Dependent Claim
30 words
The process of claim 1 wherein the surface-active agent is used in an amount of 0.004 to 0.6 part by weight per 100 parts by weight of the polyolefin resin.
Claim 13
Dependent Claim
11 words
The process of claim 1 wherein the dispersion medium is water.
Claim 14
Dependent Claim
30 words
The process of claim 1 wherein the dispersion medium is used in an amount of 100 to 1500 parts by weight per 100 parts by weight of the polyolefin resin.
Claim 15
Dependent Claim
27 words
The process of claim 1 wherein the heating is carried out at a temperature at least 5° C. higher than the melting point of the polyolefin resin.
Claim 16
Dependent Claim
58 words
The process of claim 1 wherein the polyolefin resin is pre-heated at a temperature 5° to 10° C. higher than the melting point of the polyolefin resin for about 5 to about 15 minutes, and then heated at a temperature 10° to 35° C. higher than the melting point of the polyolefin resin for at least 0.25 hour.
References Cited (Backward Citations)
US3563970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |