US3656884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of grafted solid materials of water-affinitive polymers
Assignee: Individual
•
Filing: 1968-08-12
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Granted: 1972-04-18
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Expires: 1988-08-12
Abstract
Abstract Process for the preparation of grafted solid materials of wateraffinitive polymers such as polyvinyl alcohol, acetalized polyvinyl alcohol, polyamide, polyacrylonitrile and cellulose, which comprises immersing said solid material in an aqueous solution or suspension of an ester of acrylic acid or metacrylic acid at a temperature of 40* - 120* C., in the presence of 20 1,000 ppb of molecular oxygen, as a reaction initiating component, in the aqueous solution or suspension. In this way, the graft polymerization reaction is initiated smoothly and high reaction rate of the graft polymerization is obtained without the substantial formation of homopolymer of the ester in the liquid phase.
Inventors
- 👤 Takuji Okaya
- 👤 Hirotoshi Miyazaki
- 👤 Tamotsu Eguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:17
CPC Classifications
C; C08; C08F; C08F291/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
22 words
The process of claim 1 wherein the reaction system is heated to a temperature within a range of 60* - 90* C.
Claim 2
Dependent Claim
27 words
The process of claim 1 wherein the acrylic monomer content of the aqueous solution or suspension is within a range of 0.01 - 20 percent by weight.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the weight of the aqueous solution or suspension is at least ten times the weight of the solid material.
Claim 4
Dependent Claim
108 words
The process of claim 1, wherein the solid material is continuously immersed in said aqueous solution or suspension and the monomer is continuously or intermittently supplied to the reaction system so as to maintain the acrylic monomer content at a predetermined concentration in the reaction liquid within a range of 0.01 - 20 percent by weight, while simultaneously supplying molecular oxygen into the system either continuously or intermittently, in such quantities as will not make the molecUlar oxygen concentration in the liquid phase of the reaction system greater than 800 ppb, and after a predetermined period of immersion continuously taking out the solid material from the reaction system.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the solid material is staple fiber, filament, tow, spun yarn, non-woven fabric, textiles or knit goods.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the solid material is in the form of film, ribbon, or sheet.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the solid material is in the form of powder, pellet or board.
Claim 8
Dependent Claim
22 words
The process of claim 1 wherein the polymer is selected particularly from a group consisting of polyvinyl alcohol and acetalized polyvinyl alcohol.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein said aqueous solution or suspension contains 80 - 600 ppb of molecular oxygen.
Claim 10
Dependent Claim
27 words
The process of claim 1 wherein the acrylic monomer content of the aqueous solution or suspension is within the range of 0.3 - 5 percent by weight.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |