Storage stable compositions for obtaining elastomer coatings
AssigneeElf Atochem S.A.
InventorJean-Jacques Flat
Life of this patent
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Abstract
Compositions, which are stable on storage, which make it possible to obtain elastomer coatings. The compositions are obtained from a hydroxylated urethane prepolymer and from a mixture of acrylate monomer and oligomers, capable of giving an elastomer by thermal or photochemical radical polymerization; the urethane prepolymer being obtained by condensation of a conjugated diene oligomer comprising hydroxylated endings, optionally mixed with a chain extender, with a polyisocyanate compound. These compositions can be used in the protection of electrical and/or electronic components and generally as coatings for metal surfaces or for plastic surfaces.
Claims11
A composition consisting essentially of a urethane prepolymer which is stable on storage and which gives an elastomer by thermal or photochemical radical crosslinking, having a content including the following constituents expressed in terms of parts by weight relative to the total parts by weight of the following constituents:
- 100 parts by weight of the urethane prepolymer obtained by condensation of a diene oligomer having hydroxyl endings, optionally mixed with a chain extender, with a polyisocyanate compound in a ratio by weight such that the ratio of the molar concentration of the isocyanate groups (—N═C═O) to the molar concentration of the hydroxyl groups (—OH) is from 0.05 to q, this value q being selected so as not to achieve gelling of the prepolymer,
- from 1 to 200 parts by weight of acrylate oligomer(s),
- from 1 to 100 parts by weight of acrylate monomer(s),
- from 0 to 100 parts by weight of plasticizer(s),
- from 0 to 5 parts by weight of additive(s), and
- from 0.1 to 5 parts by weight of radical initator.
A composition comprising a urethane prepolymer which is stable on storage and which gives an elastomer by thermal or photochemical radical crosslinking, having a content including the following constituents expressed in terms of parts by weight relative to the total parts by weight of the following constituents:
- 100 parts by weight of the urethane prepolymer obtained by condensation of a diene oligomer having hydroxyl endings, optionally mixed with a chain extender, with a polyisocyanate compound in a ratio by weight such that the ratio of the molar concentration of the isocyanate groups (—N═C═O) to the molar concentration of the hydroxyl groups (—OH) is from 0.05 to q, this value q being selected so as not to achieve gelling of the prepolymer,
- from 1 to 200 parts by weight of acrylate oligomer(s) having a number average molecular mass ranging from 100 to 5000 g/mol,
- from 1 to 100 parts by weight of acrylate monomer(s),
- from 0 to 100 parts by weight of plasticizer(s),
- from 0 to 5 parts by weight of additive(s), and
- from 0.1 to 5 parts by weight of radical initator.
A composition comprising a urethane prepolymer which is stable on storage and which gives an elastomer by thermal or photochemical radical crosslinking, having a content including the following constituents expressed in terms of parts by weight relative to the total parts by weight of the following constituents:
- 100 parts by weight of the urethane prepolymer obtained by condensation of a diene oligomer having hydroxyl endings, optionally mixed with a chain extender, with a polyisocyanate compound having a molecular weight of about 250 or less in a ratio by weight such that the ratio of the molar concentration of the isocyanate groups (—N═C═O) to the molar concentration of the hydroxyl groups (—OH) is from 0.05 to q, this value q being selected so as not to achieve gelling of the prepolymer,
- from 1 to 200 parts by weight of acrylate oligomer(s),
- from 1 to 100 parts by weight of acrylate monomer(s),
- from 0 to 100 parts by weight of plasticizer(s),
- from 0 to 5 parts by weight of additive(s), and
- from 0.1 to 5 parts by weight of radical initator.
Dependencies are inferred from the claim text.