US5037918A
Expired / Lapsed
US
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Perfluorocyclobutane ring-containing polymers with crosslinking
Assignee: Dow Chemical Co
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Filing: 1989-12-15
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Granted: 1991-08-06
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Expires: 2009-12-15
Abstract
Abstract A crosslinked polymer having perfluorocyclobutane rings is prepared in a process comprising the steps of: (a) contacting monomers having two dimerizable perfluorovinyl groups; (b) exposing the monomers to sufficient heat and for a sufficient time that a (linear) polymer containing perfluorocyclobutane rings is formed; and (c) exposing the polymer to sufficient crosslinking initiating means and for a sufficient time such that crosslinking occurs. Crosslinked polymers, so prepared are novel and have tensile strength and other physical proeprties enhanced over the properties of the corresponding linear polymer.
Inventors
- 👤 David A. Babb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:00
CPC Classifications
C; C10; C10M; C10M107/00; C10M107/38; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/14; C07C43/17; C07C43/20; C07C43/225; C07C65/00; C07C65/21; C07C65/24; C08; C08F; C08F16/00; C08F16/12; C08F16/32; C10M105/00; C10M105/50; C10M105/54; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/18
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
67 words
A process for preparing a crosslinked polymer having perfluorocyclobutane rings comprising the steps of: (a) contacting monomers having two dimerizable perfluorovinyl groups; (b) exposing the monomers to sufficient heat and for a sufficient time that a polymer containing perfluorocyclobutane rings is formed: and (c) exposing the polymer to sufficient crosslinking initiating means and for a sufficient time such that crosslinking occurs and a crosslinked polymer is produced.
Claim 2
Dependent Claim
67 words
A process for preparing a crosslinked polymer having perfluorocyclobutane rings comprising the steps of: (a) contacting monomers having two dimerizable perfluorovinyl groups; (b) exposing the monomers to sufficient heat and for a sufficient time that a polymer containing perfluorocyclobutane rings is formed: and (c) exposing the polymer to sufficient crosslinking initiating means and for a sufficient time such that crosslinking occurs and a crosslinked polymer is produced.
Claim 3
Dependent Claim
41 words
The process of claim 1 wherein the crosslinking of step (c) reduces the percent elongation as measured by the procedure of ASTM D790-81 by at least about 10 percent of the percent elongation measured for the polymer produced in step (b).
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein the crosslinking initiating means is a means of providing free radicals.
Claim 5
Dependent Claim
19 words
The process of claim 2 wherein the crosslinking takes place substantially without addition of a crosslinking agent or catalyst.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein the crosslinking initiating means is wave energy.
Claim 7
Dependent Claim
12 words
The process of claim 4 wherein the crosslinking initiating means is heat.
Claim 8
Dependent Claim
11 words
The process of claim 6 wherein the heat is radiant heat.
Claim 9
Dependent Claim
21 words
The process of claim 6 wherein the polymer reaches a gel point in less than about 2 hours at 360° C.
Claim 10
Dependent Claim
21 words
The process of claim 8 wherein the polymer reaches a gel point in less than about 2 hours at 320° C.
Claim 11
Dependent Claim
21 words
The process of claim 9 wherein the polymer reaches a gel point in less than about 2 hours at 280° C.
Claim 12
Dependent Claim
27 words
The process of claim 6 wherein the crosslinking step takes place at a temperature at least about 50° C. higher than the temperature used in step (b).
Claim 13
Dependent Claim
23 words
The process of claim 11 wherein the crosslinking step takes place at a temperature of from about 250° C. to about 400° C.
Claim 14
Dependent Claim
24 words
The process of claim 12 wherein the crosslinking step takes place at a temperature of from about 280° C. to about 380 ° C.
Claim 15
Dependent Claim
23 words
The process of claim 13 wherein the crosslinking step takes place at a temperature of from about 280° C. to about 340° C.
Claim 16
Dependent Claim
16 words
The process of claim 12 wherein the crosslinking step (c) takes place in a shaping apparatus.
Claim 17
Dependent Claim
44 words
The process of claim 12 wherein the tensile strength as measured by the procedure of ASTM D882-83 of the crosslinked polymer produced in step (c) is from about 10 to about 500 percent greater than that of the corresponding polymer produced in step (b).
Claim 18
Dependent Claim
44 words
The process of claim 12 wherein the tensile modulus as measured by the procedure of ASTM D882-83 of the crosslinked polymer produced in step (c) is from about 10 to about 500 percent greater than that of the corresponding polymer produced in step (b).
Claim 19
Dependent Claim
44 words
The process of claim 12 wherein the flexural modulus as measured by the procedure of ASTM D790-81 of the crosslinked polymer produced in step (c) is from about 10 to about 500 percent greater than that of the corresponding polymer produced in step (b).
Claim 20
Dependent Claim
51 words
The process of claim 1 wherein the monomers have a structure represented by Formula I: CF.sub.2 ═CF--X--R--X--CF═CF.sub.2 wherein R represents an unsubstituted or inertly substituted hydrocarbyl group: and each X is independently selected from the group consisting of groups having at least one non-carbon atom between R and --CF═CF 2 .
Claim 21
Dependent Claim
25 words
The process of claim 19 wherein X is selected from the group consisting of oxygen atoms, sulfur atoms, sulfoxide, sulfone, carbonyl, thiocarbonyl and silanediyl groups.
Claim 22
Dependent Claim
33 words
The process of claim 20 wherein R is an unsubstituted or inertly substituted group which reacts with perfluorovinyl groups residual in a substantially linear polymer to form a crosslinked or branched molecular structure.
Claim 23
Dependent Claim
21 words
The process of claim 21 wherein R includes a structure having at least two multiple bonds separated by a single bond.
Claim 24
Dependent Claim
13 words
The process of claim 22 wherein R includes at least one biphenyl group.
Claim 25
Dependent Claim
23 words
The process of claim 22 wherein each X is independently an oxygen atom, a sulfur atom, a sulfoxide group, or a sulfone group.
Claim 26
Dependent Claim
16 words
The process of claim 24 wherein the single bond is a carbon to carbon single bond.
Claim 27
Dependent Claim
22 words
The process of claim 25 wherein at least one of the multiple bonds is a bond between carbon and any other atom.
Claim 28
Dependent Claim
19 words
The process of claim 26 wherein at least one of the multiple bonds is a carbon to carbon bond.
Claim 29
Dependent Claim
18 words
The process of claim 27 wherein at least two of the multiple bonds are carbon to carbon bonds.
Claim 30
Dependent Claim
20 words
The process of claim 28 wherein at least one of the multiple bonds is a carbon to carbon double bond.
Claim 31
Dependent Claim
22 words
The process of claim 29 wherein at least two of the multiple bonds are carbon to carbon double bonds or aromatic bonds.
Claim 32
Dependent Claim
22 words
The process of claim 30 wherein R is an unsubstituted or inertly substituted biphenylene; phenylene: 9,9'-diphenylfluorene: fluorene; cyclopentadienylene; furan: or anthracene group.
Claim 33
Dependent Claim
20 words
The process of claim 1 wherein the polymer containing perfluorocyclobutane rings has perfluorocyclobutane rings in the backbone of the polymer.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
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