Patent US4510298A successfully refreshed from Google Patents.
US4510298A
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Process for making isocyanate-functional polymers containing low residual monomeric isocyanate
Assignee: EIDP Inc
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Filing: 1983-04-13
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Granted: 1985-04-09
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Expires: 2003-04-13
Abstract
Abstract Disclosed is an improvement in the (co)polymerization of an isocyanate-containing monomer, e.g., an isocyanatoalkyl methacrylate, forming a product of very low residual toxic monomeric isocyanate (less than 500 ppm) useful in avoiding air pollution. The improvement consists in adding a scavenger, a small amount of an active nonpolluting monomer such as butyl acrylate, near the end of the polymerization.
Inventors
- 👤 Roland G. Lindsey
- 👤 John A. Simms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:21
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/04; C08F265/06; C08F6/00; C08F6/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
In the process of polymerizing a substantially anhydrous mixture containing at least one polymerizable monomer having the formula ##STR4## in which A is alkylene of 2-14 carbons, the monomer being polymerized alone or with at least one compound of the formula ##STR5## in which R is hydrogen or methyl and X is phenyl, tolyl, cyano, ##STR6## R' being alkyl of 1-8 carbons; the improvement comprising supplying to and reacting with the reacting polymerizing mixture at reaction temperature when the polymerization is about 98% complete a quantity at least equal to the quantity of unreacted isocyanate monomer of an active monomer selected from the group consisting of methyl, ethyl and butyl acrylates and fumarates.
Claim 2
Dependent Claim
113 words
In the process of polymerizing a substantially anhydrous mixture containing at least one polymerizable monomer having the formula ##STR4## in which A is alkylene of 2-14 carbons, the monomer being polymerized alone or with at least one compound of the formula ##STR5## in which R is hydrogen or methyl and X is phenyl, tolyl, cyano, ##STR6## R' being alkyl of 1-8 carbons; the improvement comprising supplying to and reacting with the reacting polymerizing mixture at reaction temperature when the polymerization is about 98% complete a quantity at least equal to the quantity of unreacted isocyanate monomer of an active monomer selected from the group consisting of methyl, ethyl and butyl acrylates and fumarates.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the polymerization mixture contains 1-20% by weight, based on the weight of the reacting monomers, of a mercaptan chain-transfer agent.
Claim 4
Dependent Claim
14 words
The process of claim 2 wherein the reacting monomers are styrene and isocyanatoethyl methacrylate.
Claim 5
Dependent Claim
9 words
The process of claim 3 employing a dodecyl mercaptan.
Claim 6
Dependent Claim
8 words
The process of claim 4 employing butyl acrylate.
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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |