Patent US4352064A successfully refreshed from Google Patents.
Patent US3846523A successfully refreshed from Google Patents.
US3846523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming expanded composite materials in the absence of recognized blowing agents
Assignee: American Manufacturing Co Inc
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Filing: 1967-12-12
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Granted: 1974-11-05
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Expires: 1987-12-12
Abstract
Abstract The production of expanded polymeric materials is disclosed, wherein the expansion or foaming can be effected in the absence of recognized blowing agents. The results are accomplished by milling submicro particles of an inert filler and particles of a polymer under high impact and compression energy conditions. When the resultant composites are processed in a conventional foam generating manner, such as by extrusion, the composite expands to produce a foam having densities substantially less than a compression molded nonexpanded sample of the composite.
Inventors
- 👤 J Geerdes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:26
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/461; C; C08; C08J; C08J9/00; C08J9/0061; C08J9/0066; C08J2427/00; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/13; Y10S264/16; Y10S264/17
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A METHOD OF FORMING AN EXPANDED POLYMERIC MATERIAL COMPRISING, MILLING TOGETHER PARTICLES OF A THERMOPLASTIC POLYMERIC MATERIAL AND SUBMICRO PARTICLES OF AN ADDITIVE MATERIAL, BOTH SAID MATERIALS BEING ESSENTIALLY NON-VOLATILE AT A TEMPERATURE AT WHICH SAID POLYMERIC MATERIAL IS FLUID, SAID MILLING BEING EFFECTED BY A ROTARY IMPACT MILL HAVING IMPACTORS TRAVELING AT A VELOCITY OF AT LEAST ABOUT 600 LINEAR FEET PER SECOND, TO FORM A COMPOSITE OF SAID TWO MATERIALS, SAID COMPOSITE CONSISTING ESSENTIALLY OF SAID TWO MATERIALS, CONFINING SAID COMPOSITE IN A MOLD CAVITY UNDER PRESSURE AND HEATING SAID COMPOSITE TO SAID TEMPERATURE TO RENDER SAID POLYMERIC MATERIAL FLUID, RELEASING SAID PRESSURE WHILE SAID POLYMERIC MATERIAL IS FLUID AND PERMITTING SAID COMPOSITE TO EXPAND AS A FOAM, AND SOLIDIFYING THE FOAMED POLYMERIC MATERIAL WITH SAID ADDITIVE PARTICLES RETAINED THEREIN.
Claim 2
Independent Claim
132 words
A METHOD OF FORMING AN EXPANDED POLYMERIC MATERIAL COMPRISING, MILLING TOGETHER PARTICLES OF A THERMOPLASTIC POLYMERIC MATERIAL AND SUBMICRO PARTICLES OF AN ADDITIVE MATERIAL, BOTH SAID MATERIALS BEING ESSENTIALLY NON-VOLATILE AT A TEMPERATURE AT WHICH SAID POLYMERIC MATERIAL IS FLUID, SAID MILLING BEING EFFECTED BY A ROTARY IMPACT MILL HAVING IMPACTORS TRAVELING AT A VELOCITY OF AT LEAST ABOUT 600 LINEAR FEET PER SECOND, TO FORM A COMPOSITE OF SAID TWO MATERIALS, SAID COMPOSITE CONSISTING ESSENTIALLY OF SAID TWO MATERIALS, CONFINING SAID COMPOSITE IN A MOLD CAVITY UNDER PRESSURE AND HEATING SAID COMPOSITE TO SAID TEMPERATURE TO RENDER SAID POLYMERIC MATERIAL FLUID, RELEASING SAID PRESSURE WHILE SAID POLYMERIC MATERIAL IS FLUID AND PERMITTING SAID COMPOSITE TO EXPAND AS A FOAM, AND SOLIDIFYING THE FOAMED POLYMERIC MATERIAL WITH SAID ADDITIVE PARTICLES RETAINED THEREIN.
Claim 3
Dependent Claim
43 words
A method as set forth in claim 1, wherein said polymeric material is selected from the group consisting of polypropylene, polystyrene, polyvinyl chloride, and polycarbonate polymers, and said additive material is selected from the group consisting of asbestos, teflon, anthracite, and colloidal silica.
Claim 4
Dependent Claim
27 words
A method as set forth in claim 1, wherein said pressure is released by extrusion of the fluid polymer composite out of said cavity through an orifice.
Claim 5
Dependent Claim
19 words
A method as set forth in claim 1, wherein said additive material is composed primarily of a brittle material.
Claim 6
Dependent Claim
19 words
A method as set forth in claim 1, wherein said composite is ball-milled before introduction into said mold cavity.
Claim 7
Dependent Claim
22 words
A method as set forth in claim 1, wherein the particle size of said polymeric particles is less than about 250 microns.
Claim 8
Dependent Claim
25 words
A method as set forth in claim 1, wherein the particle size of said polymeric particles is less than about a few tens of microns.
References Cited (Backward Citations)
US2061918A
Cited
US2774105A
Cited
US3023460A
Cited
US3036335A
Cited
US3078511A
Cited
US3235640A
Cited
US3184428A
Cited
US3171604A
Cited
US3211689A
Cited
US3304282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |