US4156671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of chloroprene polymer solutions suitable for contact adhesives
Assignee: EIDP Inc
•
Filing: 1976-11-23
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Granted: 1979-05-29
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Expires: 1996-11-23
Abstract
Abstract Production of a solution of a chloroprene polymer, suitable for use as a component for an adhesive, by dissolving the polymer in a solvent, and heating the solution, adding a free-radical catalyst and contacting the solution with a molecular oxygen containing gas, until the viscosity of the solution is lowered by at least about 10%.
Inventors
- 👤 Robert W. Keown
- 👤 John W. McDonald
- 👤 Jurgen K. Weise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:05
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/04; C09; C09J; C09J111/00; Y; Y10; Y10S; Y10S526/00; Y10S526/914
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
A process for the production of a solution of a chloroprene polymer suitable for use as the major constituent in an adhesive which comprises preparing a solution of about 10 to 30 weight percent of a chloroprene polymer in a compatible organic solvent, heating the solution to a temperature in the range of about 40° to 100° C., contacting the solution with a molecular oxygen containing gas, adding a free-radical catalyst to the solution while it is maintained at a temperature of about 40° C. to 100° C., said catalyst having a half-life of 5 to 15 hours at the conditions under which the process is being conducted.
Claim 2
Dependent Claim
108 words
A process for the production of a solution of a chloroprene polymer suitable for use as the major constituent in an adhesive which comprises preparing a solution of about 10 to 30 weight percent of a chloroprene polymer in a compatible organic solvent, heating the solution to a temperature in the range of about 40° to 100° C., contacting the solution with a molecular oxygen containing gas, adding a free-radical catalyst to the solution while it is maintained at a temperature of about 40° C. to 100° C., said catalyst having a half-life of 5 to 15 hours at the conditions under which the process is being conducted.
Claim 3
Dependent Claim
40 words
The process of claim 1 in which the chloroprene polymer is selected from the class consisting of homopolymers of chloroprene and copolymers of chloroprene in which chloroprene is at least 80 weight percent of the total weight of the polymer.
Claim 4
Dependent Claim
33 words
The process of claim 2 in which the compatible organic solvent is selected from the group consisting of chlorinated hydrocarbons, aromatic hydrocarbons, ketones, esters, lower alcohols, aliphatic hydrocarbons and mixtures of these compounds.
Claim 5
Dependent Claim
32 words
The process of claim 3 in which the free-radical catalyst is selected from the class consisting of alkyl and aromatic peroxides, alkyl and aromatic hydroperoxides, azo compounds, and ketone and acid peroxides.
Claim 6
Dependent Claim
14 words
The process of claim 4 in which the molecular oxygen containing gas is air.
Claim 7
Dependent Claim
20 words
The process of claim 5 in which the solution is heated to a temperature between about 50° and 80° C.
Claim 8
Dependent Claim
27 words
The process of claim 5 in which air is fed into the solution at the rate of about 10 to 400 cubic centimeters/minute/1000 cubic centimeters of solution.
Claim 9
Dependent Claim
43 words
The process of claim 7 in which the amount of free-radical catalyst added to the solution is 0.03 to 3 parts by weight per 100 parts by weight of the polymer of chloroprene, and in which the catalyst is added in small increments.
Claim 10
Dependent Claim
31 words
The process of claim 8 in which the organic solvent is a mixture of 1 volume part toluene, 1 volume part methyl ethyl ketone and 1 volume part of normal heptane.
Claim 11
Dependent Claim
14 words
The process of claim 9 in which the free-radical producing initiator is benzoyl peroxide.
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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) | 1982-05-28 | 1982-11-27 | 1983-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-28 | 1986-11-27 | 1987-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-28 | 1990-11-27 | 1991-05-29 | $7700.00 | Window Closed / Lapsed |