EP0259711B1
Expired / Lapsed
EP
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Organosilicon polymers
Assignee: National Starch and Chemical Investment Holding Corp
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Filing: 1987-08-27
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Granted: 1994-03-30
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Expires: 2007-08-27
Abstract
No abstract record available.
Inventors
- 👤 Raymond Thomas Leibfried
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 12:42
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08L; C08L83/00; C08L83/14
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
30 words
A crosslinked or crosslinkable organosilicon polymer is characterized in that it comprises alternating (1) polycyclic hydrocarbon residues and (2) cyclic polysiloxanes or tetra(siloxy)silane residues linked through carbon to silicon bonds.
Claim 2
Dependent Claim
116 words
A crosslinked or crosslinkable organosilicon polymer according to claim 1, which is the reaction product of (a) a silicon-containing reactant selected from a cyclic polysiloxane, a tetra(siloxy)silane and mixtures of one of these, said reactant having as reactive sites at least two hydrogen atoms per molecule bonded directly to silicon and (b) a polycyclic polyene, containing as reactive sites at least two non-aromatic carbon-carbon double bonds in the rings per molecule, wherein the ratio of said carbon-carbon double bonds in (b) to said silicon-bonded hydrogen atoms in (a) is greater than 0.5:1 and up to 1.8:1 and at least one of the reactants (a) or (b) has more than two of said reactive sites per molecule.
Claim 3
Dependent Claim
86 words
A polymer as claimed in claim 2, further characterized in that the silicon-containing reactant is: wherein R, which can be the same or different, is hydrogen, a saturated, substituted or unsubstituted alkyl or alkoxy radical, a substituted or unsubstituted aromatic or aryloxy radical, n is an integer from 3 to 20, and R is hydrogen on at least two of the silicon atoms in the molecule; or is: wherein R is as defined above and is hydrogen on at least two silicon atoms in the molecule.
Claim 4
Dependent Claim
27 words
A crosslinked or crosslinkable organosilicon polymer as claimed in claim 2, further characterized in that the polycyclic polyene is norbornadiene, dicyclopentadiene, tricyclopentadiene, hexahydronaphthalene dimethanohexahydronaphthalene, or norbornadiene dimer.
Claim 5
Dependent Claim
52 words
A crosslinked organosilicon polymer as claimed in any of the claims 1-4, further characterized in that the ratio of carbon-carbon double bonds in the rings of (b) to silicon-bonded hydrogen atoms in (a) is in the range of from 0.7:1 up to 1.3:1, and the alternating residues form a crosslinked thermoset structure.
Claim 6
Dependent Claim
40 words
A crosslinked organosilicon polymer as claimed in claim 5, further characterized in that the ratio of carbon-carbon double bonds in the rings of (b) to silicon-bonded hydrogen atoms in (a) is in the range of from 0.8:1 up to 1.1:1.
Claim 7
Dependent Claim
54 words
A crosslinkable organosilicon polymer as claimed in any of claims 1-6, further characterized in that it is thermoplastic and the ratio of carbon-carbon double bonds in the rings of (b) to silicon-bonded hydrogen atoms in (a) is greater than 0.5:1 and up to 0.7:1, or in the range of from 1.3:1 up to 1.8:1.
Claim 8
Dependent Claim
27 words
Use of the organosilicon polymer of any of the preceding claims in a fiber reinforced composite structure comprising up to 80%, by weight of a fibrous reinforcement.
Claim 9
Dependent Claim
30 words
Use as claimed in claim 8 of the organosilicon polymer, further characterized in that the fibrous reinforcement is glass, carbon, metallic, ceramic, or synthetic polymer fibers, or a fiber mat.
Claim 10
Independent Claim
119 words
A method for preparing the organosilicon polymers as claimed in claims 1 to 9, characterized in that it comprises reacting, in the presence of a platinum-containing catalyst, (a) a cyclic polysiloxane or tetra(siloxy)silane containing as reactive sites at least two silicon-bonded hydrogen atoms and (b) a polycyclic polyene, containing as reactive sites at least two non-aromatic carbon-carbon double bonds in the rings per molecule, the ratio of carbon-carbon double bonds in the rings of (b) to silicon bonded hydrogen atoms in (a) being greater than 0.5:1 and up to 1.8:1 and at least one of the reactants (a) or (b) having more than two reactives sites, and subjecting said polymer to heat to drive the crosslinking to a maximum.
Claim 11
Dependent Claim
85 words
A method for preparing organosilicon polymers as claimed in claim 10, further characterized in that the cyclic polysiloxane is: wherein R is hydrogen, a saturated, substituted or unsubstituted alkyl or alkoxy radical, a substituted or unsubstituted aromatic or aryloxy radical, n is an integer from 3 to 20, and R is hydrogen on at least two of the silicon atoms in the molecule; or the tetra(siloxy)silane is: wherein R is as defined above and is hydrogen at at least two silicon atoms in the molecule.
Claim 12
Dependent Claim
41 words
A method for preparing organosilicon polymers as claimed in claim 10, further characterized in that the ratio of carbon-carbon double bonds in the rings of (b) to silicon-bonded hydrogen atoms in (a) is in the range of 0.7:1 up to 1.3:1.
Claim 13
Dependent Claim
42 words
A method for preparing organosilicon polymers as claimed in claim 12, further characterized in that the ratio of carbon-carbon double bonds in the rings of (b) to silicon-bonded hydrogen atoms in (a) is in the range of from 0.8:1 up to 1.1:1.
Claim 14
Independent Claim
32 words
A method for preparing organosilicon polymers as claimed in any of claims 10 to 13, further characterized in that the platinum-containing catalyst is selected from chloroplatinic acid, PtCl₂ and dibenzonitrile platinum dichloride.
Claim 15
Independent Claim
52 words
A method for preparing organosilicon polymers as claimed in any of claims 10 to 14, further characterized in that it includes the steps of: (i) partially reacting (a) and (b) to form a prepolymer; (ii) transferring the prepolymer to a mold; and (iii) curing the prepolymer to form a molded thermoset product.
References Cited (Backward Citations)
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