Patent US4345040A successfully refreshed from Google Patents.
US4345040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of post-chlorinated vinyl chloride polymers by phosphate salts
Assignee: Goodrich Corp
•
Filing: 1980-06-16
•
Granted: 1982-08-17
•
Expires: 2000-06-16
Abstract
Abstract The invention relates to porous post-chlorinated polyvinyl chloride resins which contain or have incorporated therein a salt of phosphoric acid resulting in a substantial improvement in the thermal stability thereof during subsequent processing. The phosphate salt is added to the porous post chlorinated polymer from an aqueous solution thereof which optionally contains a surfactant, which wets the polymer particles and allows the penetration thereof by the solution. Post chlorinated polyvinyl chloride (CPVC) is the most preferred polymer or resin.
Inventors
- 👤 Dale R. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:07
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/2053; C08J9/00; C08J9/36; C08J9/40; C08J2327/00; C08J2327/22; C08J2327/24
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
77 words
A process for producing post-chlorinated polymers having increased thermal stability during processing which comprises forming an aqueous solution containing a metal salt of phosphoric acid, contacting a porous post-chlorinated vinyl chloride polymer with said solution while agitating the mixture said polymer containing from about 64% to about 70% by weight of chlorine and from about 5% to about 65% by volume of pore space, evaporating the liquid from said mixture, and drying and recovering said so-treated resin.
Claim 2
Dependent Claim
77 words
A process for producing post-chlorinated polymers having increased thermal stability during processing which comprises forming an aqueous solution containing a metal salt of phosphoric acid, contacting a porous post-chlorinated vinyl chloride polymer with said solution while agitating the mixture said polymer containing from about 64% to about 70% by weight of chlorine and from about 5% to about 65% by volume of pore space, evaporating the liquid from said mixture, and drying and recovering said so-treated resin.
Claim 3
Dependent Claim
16 words
A process as defined in claim 1 wherein the porous polymer is post-chlorinated polyvinyl chloride homopolymer.
Claim 4
Dependent Claim
37 words
A process as defined in claim 1 wherein the porous polymer is a post-chlorinated copolymer of not less than about 95% by weight of vinyl chloride and up to 5% by weight of a polymerizable monoolefinic comonomer.
Claim 5
Dependent Claim
13 words
A process as defined in claim 3 wherein the comonomer is vinyl acetate.
Claim 6
Dependent Claim
42 words
A process as defined in claim 1 wherein the amount of salt of phosphoric acid in said solution is in the range of about 0.25 part to about 10.0 parts by weight, based on the weight of 100 parts of said solution.
Claim 7
Dependent Claim
38 words
A process as defined in claim 1 wherein a surfactant is employed in said solution in the range of about 0.0005 part to about 0.005 part by weight, based on the weight of 100 parts of said solution.
Claim 8
Dependent Claim
17 words
A process as defined in claim 1 wherein the salt of phosphoric acid is disodium hydrogen phosphate.
Claim 9
Dependent Claim
16 words
A process as defined in claim 1 wherein the salt of phosphoric acid is sodium pysophosphate.
Claim 10
Dependent Claim
14 words
A process as defined in claim 6 wherein the surfactant is sodium lauryl sulfate.
Claim 11
Dependent Claim
44 words
A process as defined in claim 1 wherein the porous post-chlorinated polyvinyl chloride has a density in the range of about 1.52 to about 1.61 grams/cc. at 25° C. and a chlorine content in the range of about 65% to about 70% by weight.
Claim 12
Dependent Claim
16 words
A process as defined in claim 5 wherein the porous polymer is post-chlorinated polyvinyl chloride homopolymer.
Claim 13
Dependent Claim
23 words
A process as defined in claim 11 wherein the porous polymer contains from about 5% to about 65% by volume of pore space.
Claim 14
Dependent Claim
17 words
A process as defined in claim 12 wherein the salt of phosphoric acid is disodium hydrogen phosphate.
Claim 15
Dependent Claim
17 words
A process as defined in claim 13 wherein sodium lauryl sulfate is employed in said aqueous solution.
Claim 16
Dependent Claim
45 words
A process as defined in claim 14 wherein the porous post-chlorinated polyvinyl chloride homopolymer has a density in the range of about 1.54 to about 1.59 grams/cc. at 25° C. and a chlorine content in the range of about 65.3% to about 68.5% by weight.
References Cited (Backward Citations)
US4170696A
Cited
US4224374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |