US5047476A
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Process for crosslinking hydrolyzable copolymers
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1989-05-12
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Granted: 1991-09-10
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Expires: 2009-05-12
Abstract
Abstract A process for crosslinking comprising the following steps: (a) admixing, in a processing zone, a copolymer containing at least one hydrolyzable silane moiety; a dihydrocarbyltin oxide; and (i) a carboxylic acid; (ii) a compound bearing at least one carboxylate moiety, which is capable of forming a carboxylic acid when subjected to heat and/or moisture; or (iii) mixtures thereof, with the proviso that: (A) in the event that component (ii) is present, the conditions in the processing zone are such that the carboxylate moiety forms a carboxylic acid; (B) the residence time of the mixture in the processing zone is sufficient to at least partially complete the processing of the copolymer, but of sufficient brevity to substantially avoid a reaction of the carboxylic acid with the dihydrocarbyltin oxide; and (b) passing the mixture from step (a) into a crosslinking zone under such reaction conditions that the carboxylic acid reacts with the dihydrocarbyltin oxide to form dihydrocarbyltin carboxylate, said crosslinking zone having a moisture content sufficient to crosslink the hydrolyzable copolymer in the presence of the dihydrocarbyltin carboxylate.
Inventors
- 👤 Michael J. Keogh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:29
CPC Classifications
C; C08; C08L; C08L43/00; C08L43/04; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/56; C08K5/57
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
176 words
A process for crosslinking comprising the following steps: (a) admixing, in a processing zone, a copolymer containing at least one hydrolyzable silane moiety; a dihydrocarbyltin oxide; and (i) a carboxylic acid; (ii) a compound bearing at least one carboxylate moiety, which is capable of forming a carboxylic acid when subjected to heat and/or moisture; or (iii) mixtures thereof, with the proviso that: (A) in the event that component (ii) is present, the conditions in the processing zone are such that the carboxylate moiety forms a carboxylic acid; (B) the residence time of the mixture in the processing zone is sufficient to at least partially complete the processing of the copolymer, but of sufficient brevity to substantially avoid a reaction of the carboxylic acid with the dihydrocarbyltin oxide; and (b) passing the mixture from step (a) into a crosslinking zone under such reaction conditions that the carboxylic acid reacts with the dihydrocarbyltin oxide to form dihydrocarbyltin carboxylate, said crosslinking zone having a moisture content sufficient to crosslink the hydrolyzable copolymer in the presence of the dihydrocarbyltin carboxylate.
Claim 2
Dependent Claim
176 words
A process for crosslinking comprising the following steps: (a) admixing, in a processing zone, a copolymer containing at least one hydrolyzable silane moiety; a dihydrocarbyltin oxide; and (i) a carboxylic acid; (ii) a compound bearing at least one carboxylate moiety, which is capable of forming a carboxylic acid when subjected to heat and/or moisture; or (iii) mixtures thereof, with the proviso that: (A) in the event that component (ii) is present, the conditions in the processing zone are such that the carboxylate moiety forms a carboxylic acid; (B) the residence time of the mixture in the processing zone is sufficient to at least partially complete the processing of the copolymer, but of sufficient brevity to substantially avoid a reaction of the carboxylic acid with the dihydrocarbyltin oxide; and (b) passing the mixture from step (a) into a crosslinking zone under such reaction conditions that the carboxylic acid reacts with the dihydrocarbyltin oxide to form dihydrocarbyltin carboxylate, said crosslinking zone having a moisture content sufficient to crosslink the hydrolyzable copolymer in the presence of the dihydrocarbyltin carboxylate.
Claim 3
Dependent Claim
25 words
The process defined in claim 1 wherein the copolymer is obtained from one or more alpha-olefin comonomers and one or more alkenyl alkoxy silane comonomers.
Claim 4
Dependent Claim
15 words
The process defined in claim 2 wherein the copolymer is an ethylene/vinyl trimethoxy silane copolymer.
Claim 5
Dependent Claim
25 words
The process defined in claim 1 wherein the copolymer is a silane grafted homopolymer or copolymer or a copolymer of an olefin and a silane.
Claim 6
Dependent Claim
33 words
The process defined in claim 1 wherein the dihydrocarbyl tin oxide has the formula R 2 SnO wherein R is an alkyl or aryl radical and each R can be alike or different.
Claim 7
Dependent Claim
12 words
The process defined in claim 1 wherein a carboxylic acid is present.
Claim 8
Dependent Claim
13 words
The process defined in claim 1 wherein an organic acid anhydride is present.
Claim 9
Dependent Claim
31 words
The process defined in claim 1 wherein a compound having at least one carboxylate moiety, which is capable of forming a carboxylic acid when subjected to heat and/or moisture, is present.
Claim 10
Dependent Claim
25 words
The process defined in claim 1 wherein the residence time in the processing zone is in the range of about 20 to about 2000 seconds.
Claim 11
Dependent Claim
25 words
The process defined in claim 1 wherein the temperature in the processing zone is in the range of about 20° C. to about 350° C.
Claim 12
Dependent Claim
14 words
The process defined in claim 1 wherein the processing zone is an extrusion zone.
Claim 13
Dependent Claim
25 words
The process defined in claim 1 wherein the temperature in the crosslinking zone is in the range of about 20° C. to about 200° C.
Claim 14
Dependent Claim
15 words
The process defined in claim 1 wherein the compound has 1 to 30 carbon atoms.
Claim 15
Dependent Claim
24 words
The process defined in claim 1 wherein the compound of paragraph (a) (ii) is a homopolymer or copolymer bearing at least one carboxylate moiety.
Claim 16
Dependent Claim
47 words
A composition comprising a copolymer containing at least one hydrolyzable silane moiety; a dihydrocarbyltin oxide; and (i) a carboxylic acid, (ii) a compound bearing at least one carboxylate moiety, which is capable of forming a carboxylic acid when subjected to heat and/or moisture, or (iii) mixtures thereof.
Claim 17
Dependent Claim
47 words
A composition comprising a copolymer containing at least one hydrolyzable silane moiety; a dihydrocarbyltin oxide; and (i) a carboxylic acid, (ii) a compound bearing at least one carboxylate moiety, which is capable of forming a carboxylic acid when subjected to heat and/or moisture, or (iii) mixtures thereof.
Claim 18
Dependent Claim
25 words
The composition defined in claim 15 wherein the copolymer is obtained from one or more alpha-olefin comonomers and one or more alkenyl alkoxy silane comonomers.
Claim 19
Dependent Claim
15 words
The composition defined in claim 16 wherein the copolymer is an ethylene/vinyl trimethoxy silane copolymer.
Claim 20
Dependent Claim
24 words
The composition defined in claim 15 wherein the copolymer is a silane grafted homopolymer or copolymer or a copolymer of olefin and a silane.
Claim 21
Dependent Claim
32 words
The composition defined in claim 15 wherein the dihydrocarbyltin oxide has the formula R 2 SnO wherein R is an alkyl or aryl radical and each R can be alike or different.
Claim 22
Dependent Claim
12 words
The composition defined in claim 15 wherein a carboxylic acid is present.
Claim 23
Dependent Claim
13 words
The composition defined in claim 15 wherein an organic acid anhydride is present.
Claim 24
Dependent Claim
31 words
The composition defined in claim 15 wherein a compound bearing at least one carboxylate moiety, which is capable of forming a carboxylic acid when subjected to heat and/or moisture, is present.
Claim 25
Dependent Claim
15 words
The composition defined in claim 15 wherein the compound has 1 to 30 carbon atoms.
Claim 26
Dependent Claim
23 words
The composition defined in claim 15 wherein the compound of item (ii) is a homopolymer or copolymer bearing at least one carboxylate moiety.
References Cited (Backward Citations)
US4753992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |