US3876577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitised latices
Assignee: Bayer AG
•
Filing: 1973-06-26
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Granted: 1975-04-08
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Expires: 1993-06-26
Abstract
Abstract A process for the preparation of heat-sensitive latices, characterised in that a mixture of 45-80 % by weight of butadiene, 10-45 % by weight of acrylonitrile, 0-20 % by weight of styrene, 0.5-10 % by weight of (meth)acrylic acid, 2-10 % by weight of (meth)acrylamide and 0-5 % by weight of (meth) acrylamido-N-methylolmethyl ether is polymerised on radical initiators in an aqueous emulsion in the presence of 1-10 % by weight of an emulsifier or a mixture of several emulsifiers, only a small proportion of the total quantity of emulsifier being present at the beginning of polymerisation, the remainder being added in the course of polymerisation.
Inventors
- 👤 Heinz Hornig
- 👤 Edmund Huther
- 👤 Ernst Schwinum
- 👤 Gustav Sinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:03
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F220/00; C08F220/02; C08F220/42; C08F220/44; C08L; C08L55/00; C08L55/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
A PROCESS FOR PREPARING A HEAT SENSITIVE LATEX WHICH COMPRISES POLYMERIZING A MIXTURE OF 45 TO 80% BY WEIGHT OF BUTADIENE, 10 TO 45% BY WEIGHT OF ACRYLONITRILE, 0 TO 20% BY WEIGHT OF STYRENE, 0.5 TO 10% BY WEIGHT OF ACRYLIC ACID, METHACRYLIC ACID OR A MIXTURE THEREOF, 2 TO 10% BY WEIGHT OF ACRYLAMIDE, METHACRYLAMIDE OR A MIXTURE THEREOF AND 0 TO 5% BY WEIGHT OF METHACRYLAMIDO-N-METHYLOL METHYL ETHER, ACRYLAMIDO-N-METHYLOL METHYL ETHER OR A MIXTURE THEREOF IN AN AQUEOUS EMULSION IN THE PRESENCE OF A FREE RADICAL INITIATOR AND AT LEAST ONE EMULSIFIER IN AMOUNT OF 1 TO 10% BY WEIGHT, BASED ON THE MONOMER MIXTURE, ONLY A MINOR PROPORTION OF THE TOTAL QUANTITY OF EMULSIFIER EMPLOYED BEING PRESENT AT THE BEGINNING OF POLYMERIZATION AND THE REMAINDER OF THE EMULSIFIER BEING ADDED DURING THE COURSE OF POLYMERIZATION AT SUCH A RATE WHEN U% BY WEIGHT OF THE MONOMERS HAVE BEEN POLYMERIZED, X% BY WEIGHT OF THE TOTAL QUANTITY OF EMULSIFIERS BEING PRESENT IN THE REACTION MIXTURE ACCORDING TO THE ARRANGMENT WHEREIN
Claim 2
Dependent Claim
173 words
A PROCESS FOR PREPARING A HEAT SENSITIVE LATEX WHICH COMPRISES POLYMERIZING A MIXTURE OF 45 TO 80% BY WEIGHT OF BUTADIENE, 10 TO 45% BY WEIGHT OF ACRYLONITRILE, 0 TO 20% BY WEIGHT OF STYRENE, 0.5 TO 10% BY WEIGHT OF ACRYLIC ACID, METHACRYLIC ACID OR A MIXTURE THEREOF, 2 TO 10% BY WEIGHT OF ACRYLAMIDE, METHACRYLAMIDE OR A MIXTURE THEREOF AND 0 TO 5% BY WEIGHT OF METHACRYLAMIDO-N-METHYLOL METHYL ETHER, ACRYLAMIDO-N-METHYLOL METHYL ETHER OR A MIXTURE THEREOF IN AN AQUEOUS EMULSION IN THE PRESENCE OF A FREE RADICAL INITIATOR AND AT LEAST ONE EMULSIFIER IN AMOUNT OF 1 TO 10% BY WEIGHT, BASED ON THE MONOMER MIXTURE, ONLY A MINOR PROPORTION OF THE TOTAL QUANTITY OF EMULSIFIER EMPLOYED BEING PRESENT AT THE BEGINNING OF POLYMERIZATION AND THE REMAINDER OF THE EMULSIFIER BEING ADDED DURING THE COURSE OF POLYMERIZATION AT SUCH A RATE WHEN U% BY WEIGHT OF THE MONOMERS HAVE BEEN POLYMERIZED, X% BY WEIGHT OF THE TOTAL QUANTITY OF EMULSIFIERS BEING PRESENT IN THE REACTION MIXTURE ACCORDING TO THE ARRANGMENT WHEREIN
Claim 3
Dependent Claim
14 words
A process as claimed in claim 1 in which a single emulsifier is used.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1 in which a mixture of two or more emulsifiers is used.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1 in which 0.05 to 10% by weight of heat-sensitising agent is added.
Claim 6
Dependent Claim
16 words
A process as claimed in claim 1 in which the heat-sensitising agent used is an organopolysiloxane.
References Cited (Backward Citations)
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US3546154A
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US3484394A
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |