US3886100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing polymer particles having uniform cross-linking and expanded shaped articles obtained therefrom
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1974-06-28
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Granted: 1975-05-27
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Expires: 1994-06-28
Abstract
Abstract Method of manufacturing polyolefin resin particles cross-linked uniformly by impregnating uniformly cross-linking agent into polymer particles and performing cross-linking reaction in an aqueous suspension containing a small amount of surface active agent, cross-linking agent, such as organic peroxide, polyolefin resin particles, and inorganic metallic salt. Expandable crosslinked polymer particles and expanded shaped articles are obtained therefrom.
Inventors
- 👤 Yoshizo Yasuda
- 👤 Itaru Hatano
- 👤 Yasuyuki Suganuma
- 👤 Tomohumi Kameo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:00
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J9/00; C08J9/16; C08J9/18; Y; Y10; Y10S; Y10S521/00; Y10S521/91
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
53 words
A METHOD OF MANUFACTURING POLYMER PARTICLES HAVING UNIFORM CROSS-LINKING COMPRISING THE STEPS OF SUSPENDING IN WATER PARTICLES OF POLYOLEFIN RESIN SURFACE ACTIVE AGENT, ORGANIC PEROXIDE CROSS-LINKING AGENT, AND INORGANIC METALLIC SALT, AND HEATING SAID SUSPENSION SYSTEM TO A TEMPERATURE SUFFICIENT TO CAUSE PENETRATION OF SAID CROSS-LINKING AGENT INTO SAID PARTICLES, AND CROSS-LINKING REACTION.
Claim 2
Independent Claim
53 words
A METHOD OF MANUFACTURING POLYMER PARTICLES HAVING UNIFORM CROSS-LINKING COMPRISING THE STEPS OF SUSPENDING IN WATER PARTICLES OF POLYOLEFIN RESIN SURFACE ACTIVE AGENT, ORGANIC PEROXIDE CROSS-LINKING AGENT, AND INORGANIC METALLIC SALT, AND HEATING SAID SUSPENSION SYSTEM TO A TEMPERATURE SUFFICIENT TO CAUSE PENETRATION OF SAID CROSS-LINKING AGENT INTO SAID PARTICLES, AND CROSS-LINKING REACTION.
Claim 3
Independent Claim
67 words
A method of manufacturing foamable cross-linked polymer particles, comprising the steps of dispersing in water polyolefin resin particles, surface active agent, organic peroxide cross-linking agent and inorganic metallic salt, heating said dispersion at a temperature sufficient to cause said cross-linking agent to impregnate said particles and cross-linking reaction thereby to produce homogeneous cross-linked polymer particles having gel content of between 10% to 70%, and adding foaming agent.
Claim 4
Independent Claim
67 words
A method of manufacturing foamable cross-linked polymer particles, comprising the steps of dispersing in water polyolefin resin particles, surface active agent, organic peroxide cross-linking agent and inorganic metallic salt, heating said dispersion at a temperature sufficient to cause said cross-linking agent to impregnate said particles and cross-linking reaction thereby to produce homogeneous cross-linked polymer particles having gel content of between 10% to 70%, and adding foaming agent.
Claim 5
Independent Claim
109 words
A method of manufacturing expanded shaped product of polyolefin resin, comprising the steps of dispersing polyolefin resin particles, surface active agent, organic peroxide cross-linking agent and finely pulverized difficulty soluble inorganic salt in water, heating said aqueous dispersion to a temperature sufficient to cause said cross-linking agent to impregnate into said resin particles and cross-linking reaction thereby to produce homogeneous cross-linked polymer particles having gel fraction of 10% to 70%, adding foaming agent to said particles, pre-foaming the resulting product, preserving the resulting polymer in foaming agent, and subjecting said pre-foamed polymer to foaming with use of heat in an open or closable mold which cannot be closed tightly.
Claim 6
Independent Claim
109 words
A method of manufacturing expanded shaped product of polyolefin resin, comprising the steps of dispersing polyolefin resin particles, surface active agent, organic peroxide cross-linking agent and finely pulverized difficulty soluble inorganic salt in water, heating said aqueous dispersion to a temperature sufficient to cause said cross-linking agent to impregnate into said resin particles and cross-linking reaction thereby to produce homogeneous cross-linked polymer particles having gel fraction of 10% to 70%, adding foaming agent to said particles, pre-foaming the resulting product, preserving the resulting polymer in foaming agent, and subjecting said pre-foamed polymer to foaming with use of heat in an open or closable mold which cannot be closed tightly.
Claim 7
Dependent Claim
46 words
Method of claim 1, wherein said cross-linking agent is used in an amount up to 3% by weight of said resin, and is selected from the group consisting of dicumyl peroxide, 2.5 dimethyl 2.5 (di-tertiary butyl peroxy)hexane, di-tertiary butyl perphthalate, tertiary butyl hydroperoxide and mixtures thereof.
Claim 8
Dependent Claim
16 words
Method of claim 4, wherein there is further added to said cross-linking agent a polyfunctional monomer.
Claim 9
Dependent Claim
29 words
Method of claim 1, wherein said surface active agent is selected from the group consisting of polyoxyethylene octyl phenol ether, dodecyl benzene sulfonate, sodium dialkyl sulfosuccinate and mixtures thereof.
Claim 10
Dependent Claim
26 words
Method of claim 6, wherein said surface active agent is used in an amount of from 5 to 50 percent by weight of said cross-linking agent.
Claim 11
Dependent Claim
38 words
Method of claim 1, wherein said inorganic metallic salt is used in an amount of up to 1% by weight of said resin and is selected from the group consisting of metallic phosphates, metallic oxides, and metallic hydroxides.
Claim 12
Dependent Claim
23 words
Method of claim 2, wherein said foaming agent is used in an amount of from 1% to 20% by weight of said resin.
Claim 13
Dependent Claim
26 words
Method of claim 3, wherein said pre-foaming comprises heating at between 100*C and 300*C, and expanding to about 5 to 30 times the original particle size.
Claim 14
Dependent Claim
18 words
Method of claim 3, wherein said prserving is in a mixture of foaming gas and an inert gas.
Claim 15
Dependent Claim
22 words
Polymer particles produced by the method of claim 1 wherein said inorganic metal salt is adhered to the surfaces of said particles.
Claim 16
Dependent Claim
11 words
Foamable cross-linked polymer particles produced by the method of claim 2.
Claim 17
Dependent Claim
23 words
Expanded shaped product produced by the method of claim 3, wherein said inorganic metal salt is adhered to the surfaces of said particles.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |