US4970263A
Expired / Lapsed
US
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Secondary cross-linked semi-interpenetrating polymer networks and methods of making same
Assignee: Evonik Corp
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Filing: 1987-12-18
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Granted: 1990-11-13
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Expires: 2007-12-18
Abstract
Abstract Silicone semi-interpenetrating polymer networks are formed in thermoplastic polymer matrices by the vulcanization of a hydride group-containing silicon with a polymer containing unsaturated groups. The semi-IPN is then cross-linked by hydrolysis of SiOR groups on the polymer network, so that the OR groups are hydrolyzed to allow condensation of silanol groups to form SiOSi cross-links between the chains of the polymer network. Preferably, the polymer containing unsaturated groups in an alkoxysilyl-modified poly 1,2-butadiene. The resulting cross-linked products have improved chemical resistance, increased compressive or tensile strength and excellent temperature resistance and electrical properties for use in applications such as paper-making felts and wire and cable insulation.
Inventors
- 👤 Barry C. Arkles
- 👤 Robert A. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:55
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04; C08G; C08G77/00; C08G77/42; C08L101/00; C08L77/00; C08L83/00; C08L83/04; C08G77/04; C08G77/12; C08G77/22; C08G77/26; C08G77/70; C08L2205/00; C08L2205/04; C08L23/00; C08L23/02; C08L53/00
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
99 words
A polymeric composition comprising a polymeric thermoplastic matrix and a cross-linked silicone semi-interpenetrating polymer network within said matrix, said network being formed by two distinct reactions, one reaction being the vulcanization within said matrix of a hydride group-containing silicone with a polymer containing at least one unsaturated group to form a semi-interpenetrating polymer network and the other reaction being the hydrolysis of SiOR groups on said polymer network wherein OR is an easily hydrolyzable group which in the presence of water is hydrolyzed, followed by condensation of silanol groups to form SiOSi cross-links between chains of said polymer network.
Claim 2
Dependent Claim
99 words
A polymeric composition comprising a polymeric thermoplastic matrix and a cross-linked silicone semi-interpenetrating polymer network within said matrix, said network being formed by two distinct reactions, one reaction being the vulcanization within said matrix of a hydride group-containing silicone with a polymer containing at least one unsaturated group to form a semi-interpenetrating polymer network and the other reaction being the hydrolysis of SiOR groups on said polymer network wherein OR is an easily hydrolyzable group which in the presence of water is hydrolyzed, followed by condensation of silanol groups to form SiOSi cross-links between chains of said polymer network.
Claim 3
Dependent Claim
26 words
A composition according to claim 1 wherein said network comprises about 1 weight percent to about 60 weight percent of the total weight of the composition.
Claim 4
Dependent Claim
37 words
A composition according to claim 1 wherein said thermoplastic matrix is selected from the group consisting of polyamides, thermoplastic polyurethanes, biphenol A polycarbonates, styrene-ethylene-butylene-styrene block copolymers, polyacetals, polyolefins, styrene-butadiene copolymers, polyolefin elastomers, and polyamide-polyether elastomer base resins.
Claim 5
Dependent Claim
17 words
A composition according to claim 1 wherein said vulcanization occurs in the presence of a platinum catalyst.
Claim 6
Dependent Claim
14 words
A composition according to claim 1 wherein said unsaturated group comprises a vinyl group.
Claim 7
Dependent Claim
62 words
A composition according to claim 5 wherein said vulcanization forms a predominantly chain-extended structure wherein said vinyl-containing polymer contains from about two or about four vinyl groups and wherein said hydride group-containing silicone contains 1 to 2 times the equivalent of said vinyl-containing polymer with the ratio of said hydride groups to said vinyl groups being between about 1.2:1 and about 6:1.
Claim 8
Dependent Claim
17 words
A composition according to claim 5 wherein the vinyl-containing polymer has two vinyl groups in terminal positions.
Claim 9
Dependent Claim
61 words
A composition to claim 5 wherein said vulcanization forms a predominantly cross-linked structure wherein said vinyl-containing polymer contains from about two to about thirty vinyl groups and said hydride group-containing silicone contains from two to ten times the equivalent of said vinyl-containing polymer with the ratio of the hydride groups to the vinyl groups being between about 1.2:1 and about 6:1.
Claim 10
Dependent Claim
25 words
A composition according to claim 5 wherein the vinyl group is on a butadiene copolymer or polymer containing a significant proportion of poly 1,2-butadiene units.
Claim 11
Dependent Claim
17 words
A composition according to claim 5 wherein the vinyl group is on a triethoxysilyl modified poly 1,2-butadiene.
Claim 12
Independent Claim
88 words
A method of preparing a cross-linked silicone semi-interpenetrating polymer network comprising vulcanizing a silicone component by the reaction of a hydride group-containing silicone and a polymer containing at least one unsaturated group with a polymeric thermoplastic matrix at least partially during thermoplastic melt-processing of said silicone component and said matrix, and cross-linking the newtwork formed by said vulcanization by hydrolyzing SiOR groups on said polymer network to allow condensation of silanol groups to form SiOSi cross-links between chains of said polymer network, wherein OR is a hydrolyzable group.
Claim 13
Independent Claim
88 words
A method of preparing a cross-linked silicone semi-interpenetrating polymer network comprising vulcanizing a silicone component by the reaction of a hydride group-containing silicone and a polymer containing at least one unsaturated group with a polymeric thermoplastic matrix at least partially during thermoplastic melt-processing of said silicone component and said matrix, and cross-linking the newtwork formed by said vulcanization by hydrolyzing SiOR groups on said polymer network to allow condensation of silanol groups to form SiOSi cross-links between chains of said polymer network, wherein OR is a hydrolyzable group.
Claim 14
Dependent Claim
14 words
A method according to claim 11 wherein said unsaturated group is a vinyl group.
Claim 15
Dependent Claim
17 words
A method according to claim 11 wherein said vulcanization occurs in the presence of a platinum catalyst.
Claim 16
Dependent Claim
38 words
A method according to claim 11 wherein said thermoplastic matrix is selected from the group consisting of polyamides, thermoplastic polyurethanes, bisphenol A polycarbonates, styrene-ethylene-butylene-styrene block copolymers, styrene butadiene copolymers, polyolefins, polyacetals, polyolefin elastomers and polyamide-polyether elastomer base resins.
Claim 17
Dependent Claim
78 words
A method according to claim 12 wherein a predominantly chain-extended structure is formed by combining a hydride group-containing silicone and a vinyl group-containing polymer with the vinyl group-containing polymer having from about two or about four vinyl group and the hydride group-containing silicone containing 1 to 2 times the equivalent of the vinyl functionally with the ratio of the hydride groups to the vinyl groups being about 1.2:1 to 6:1, adding a catalyst and melt-processing the resultant mixture.
Claim 18
Dependent Claim
11 words
A method according to claim 11 wherein said melt-processing comprises extrusion.
Claim 19
Dependent Claim
14 words
A method according to claim 16 wherein said extrusion comprises forming a fibrous mat.
Claim 20
Dependent Claim
24 words
A method according to claim 11 wherein said hydrolysis reaction comprises immersion of the vulcanized network and thermoplastic matrix in hot water or stream.
Claim 21
Dependent Claim
21 words
A method according to claim 18 wherein said vulcanized network and thermoplastic matrix are dried by heating prior to said immersion.
Claim 22
Dependent Claim
21 words
A method according to claim 18 wherein said vulcanized network and thermoplastic matrix are dried by heating subsequent to said immersion.
Claim 23
Dependent Claim
54 words
A method according to claim 12 wherein a predominantly cross-linked structure is formed by separately extruding the vinyl group-containing polymer and hydride group-containing silicone into separate portons of said thermoplastic matrix, mixing the portions, adding a catalyst and melting the portions together so as to react the vinyl group-containing polymer and hydride group-containing silicone.
Claim 24
Dependent Claim
44 words
A method according to claim 12 wherein a predominantly cross-linked structure is formed by extruding together the vinyl group-containing polymer and hydride group-containing silicone into said thermoplastic matrix in the presence of a platinum catalyst and a fugitive inhibitor and melt-processing the resultant mixture.
Claim 25
Dependent Claim
53 words
A method according to claim 21 wherein the vinyl-group containing silicone contains from about two to about thirty vinyl groups and the hydride group-containing silicone contains from two to ten times the equivalent of the vinyl functionality with the ratio of the hydride groups to the vinyl groups being about 1.2:1 to 6:1.
Claim 26
Dependent Claim
25 words
A method according to claim 12 wherein the vinyl group is on a butadiene copolymer of copolymer containing a significant proportion of poly 1,2-butadiene units.
Claim 27
Dependent Claim
17 words
A method according to claim 12 wherein the vinyl group is on a triethoxysilyl modified poly 1,2-butadiene.
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) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |