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Patent US4771110A successfully refreshed from Google Patents.
US4771110A
Expired / Lapsed
US
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Polymeric materials having controlled physical properties and processes for obtaining these
Assignee: Air Products and Chemicals Inc
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Filing: 1986-02-04
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Granted: 1988-09-13
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Expires: 2006-02-04
Abstract
Abstract Ground polymer elastomer or other polymeric plastic, particularly from recovered scrap, is surface modified by treatment with a gaseous mixture containing a minor amount of fluorine and a larger amount of at least one reactive gas in an inert gaseous carrier. By the treatment the ground material is made more compatible for admixture with polyfunctional polymer-forming liquids, thereby obtaining novel composites of controlled physical properties. The other reactive gas is preferably oxygen or one of the gases from the group consisting of: chlorine and SO 2 with or without added oxygen.
Inventors
- 👤 Bernard D. Bauman
- 👤 Patricia E. Burdick
- 👤 Rajendra K. Mehta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:47
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08C; C08C19/00; C08C19/12; C08C19/14; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; C08G85/00; C08J11/00; C08J11/04; C08J2375/00; C08J2375/04; Y; Y02; Y02P; Y02P20/00; Y02P20/141; Y02P20/143; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
77 words
A method which comprises subjecting polymeric particles, selected from the group consisting of natural rubber, styrene-butadiene rubber, polymers of ethylene-propylene diene monomers, polyethylene terephthalate and polypropylene, in finely divided form to contact with a gaseous medium comprising elemental fluorine and at least one other reactive gas for a time sufficient to effect chemical modification of the surface layer of the particles by formation therein of reactive functional groups, and incorporating the treated particles in a polyurethane-forming liquid.
Claim 2
Independent Claim
77 words
A method which comprises subjecting polymeric particles, selected from the group consisting of natural rubber, styrene-butadiene rubber, polymers of ethylene-propylene diene monomers, polyethylene terephthalate and polypropylene, in finely divided form to contact with a gaseous medium comprising elemental fluorine and at least one other reactive gas for a time sufficient to effect chemical modification of the surface layer of the particles by formation therein of reactive functional groups, and incorporating the treated particles in a polyurethane-forming liquid.
Claim 3
Dependent Claim
19 words
The method as defined in claim 1 wherein said gaseous medium includes elemental oxygen and an inert diluent gas.
Claim 4
Dependent Claim
13 words
The method as defined in claim 2 wherein said polymeric particles are elastomeric.
Claim 5
Dependent Claim
39 words
The method as defined in claim 3 wherein said gaseous medium comprises 1×10 -4 to 25 percent by volume elemental fluorine and 1×10 -3 to 25 percent by volume elemental oxygen, the rest consisting essentially of inert gaseous diluent.
Claim 6
Dependent Claim
19 words
The method as defined in claim 1 wherein said gaseous medium includes SO 2 and an inert diluent gas.
Claim 7
Dependent Claim
13 words
The method as defined in claim 5 wherein said polymeric particles are elastomeric.
Claim 8
Dependent Claim
39 words
The method as defined in claim 5 wherein said gaseous medium comprises 1×10 -4 to 25% by volume of elemental fluorine and 1% to 50% by volume of SO 2 , the rest consisting essentially of inert gaseous diluent.
Claim 9
Dependent Claim
36 words
The method as defined in claim 2 wherein said gaseous medium further includes a reactive gas from the group consisting of Cl 2 , SO 2 , Br 2 , BrCl 3 , BrCl, and CO.
Claim 10
Dependent Claim
12 words
The method as defined in claim 8 wherein said particles are elastomeric.
Claim 11
Dependent Claim
40 words
The method as defined in claim 1 wherein said gaseous medium includes at least one reactive gas from the group consisting of O 2 , Cl 2 , SO 2 , Br 2 , BrCl 3 , BrCl, and CO.
Claim 12
Dependent Claim
12 words
The method as defined in claim 10 wherein said particles are elastomeric.
Claim 13
Dependent Claim
17 words
The method as defined in claim 1 wherein said polymeric particles are composed of a non-elastomeric thermoplastic.
Claim 14
Dependent Claim
22 words
The method as defined in claim 12 wherein said polymeric particles are selected from the group consisting of polyethylene terephthalate and polypropylene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |