Primer for polyurethane adhesive
AssigneeDdp Specialty Electronic Materials US, LLC
InventorsThomas Clark, Niranjan Malvadkar, Daniel P. Sophiea, Huide Zhu
Life of this patent
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Abstract
A method is provided for bonding substrates having dissimilar coefficients of thermal expansion, using a thermoset adhesive. The method involves a pre-cure step using radio-frequency energy, followed by a heat-curing step.
Claims50
A primer composition for urethane-based adhesives, comprising:
- a) at least one adhesion promoter;
- b) at least one catalyst;
- c) at least one solvent;
- and d) at least one blocked amino-silane with the following formula:
- where R1 is OCH3 or OC2H5;
- R2 and R3 are independently selected from OCH3, OC2H5, and CmH2m+1 where m is an integer of 1 to 5;
- R4 is CnH2n where n is an integer of 1 to 12;
- R5 is H or CpH2p+1, branched or unbranched, where p is an integer of 1 to 10;
- R6 is CqH2q+1, branched or unbranched, where q is an integer of 1 to 10.
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A method for priming a substrate, comprising the step of applying on the surface of the substrate a primer comprising:
- a) at least one adhesion promoter;
- b) at least one catalyst;
- c) at least one solvent;
- and d) at least one blocked amino-silane with the following formula:
- where R1 is OCH3 or OC2H5;
- R2 and R3 are independently selected from OCH3, OC2H5, and CnH2n+1 where n is an integer of 1 to 5;
- R4 is CnH2n where n is an integer of 1 to 12;
- R5 is H or CnH2n+1 where n is an integer of 1 to 10;
- R6 is CnH2n+1 where n is an integer of 1 to 10.
A method of adhering a first and second substrate, comprising the steps of:
- (1) applying to the surface of the first substrate, the second substrate or both a primer comprising:
- a) at least one adhesion promoter;
- b) at least one catalyst;
- c) at least one solvent;
- and d) at least one blocked amino-silane with the following formula:
- where R1 is OCH3 or OC2H5;
- R2 and R3 are independently selected from OCH3, OC2H5, and CnH2n+1 where n is an integer of 1 to 5;
- R4 is CnH2n where n is an integer of 1 to 12;
- R5 is H or CnH2n+1 where n is an integer of 1 to 10;
- R6 is CnH2n+1 where n is an integer of 1 to 10;
- (2) allowing the solvent to evaporate;
- (3) applying a polyurethane-based adhesive to the first substrate, the second substrate or both in such a way that it will be in contact with the primer when the substrates are assembled;
- and
- (4) assembling the first substrate and second substrate such that the adhesive is sandwiched between them.
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Dependencies are inferred from the claim text.