Consumer polyolefin primer
AssigneeLoctite Corporation
InventorsPatrick F. McDonnell, Gerard M. Wren, Edward K. Welch, II
Life of this patent
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Abstract
A method of bonding a plastic substrate with an alpha-cyanoacrylate adhesive in which a primer comprising an ethylenediamine is used. The method is particularly suitable for use in bonding polyolefins in the consumer market.
Claims20
A method of bonding a pair of substrates at least one of which is a plastic substrate, the method comprising:
- applying to said plastic substrate a primer solution comprising between 0.01 and 0.75% of an adhesion-promoting ethylenediamine primer substance selected from the group consisting of (a) first ethylenediamine compounds having the formula:
- ##STR6## wherein each R, which may be the same or different, is hydrogen, an alkyl, alkenyl or alkoxy group having 1 to 8 carbon atoms, an aryl group having 6 to 8 carbon atoms, a nitrogen-or sulphur-substituted group having 1 to 8 carbon atoms or a heterocyclic group having up to 8 carbon atoms which may be unsubstituted or substituted with hydroxy, ether oxygen or sulphur, (b) mixtures of said first ethylenediamine compounds, and (c) mixtures of a first said ethylenediamine compound and a second ethylenediamine compound of the formula:
- ##STR7## wherein at least one R' group has the formula:
- ##STR8## wherein R.sub.1 is a branched or straight-chained aliphatic group having 3 to 8 carbon atoms, R.sub.2, is a branched or straight-chained aliphatic group having 1 to 8 carbon atoms, and the remaining R' groups are defined as for R, dissolved in a solvent;
- allowing the primer solution to dry;
- applying an alpha-cyanoacrylate adhesive to one of said substrates;
- and,
- joining the substrates.
A two-part adhesive system comprising an alpha-cyanoacrylate adhesive and a primer solution comprising between 0.01 and 0.75% of an adhesion-promoting ethylenediamine primer substance selected from the group consisting of (a) first ethylenediamine compounds having the formula:
- ##STR10## wherein each R, which may be the same or different, is hydrogen, an alkyl, alkenyl or alkoxy group having 1 to 8 carbon atoms, an aryl group having 6 to 8 carbon atoms, a nitrogen-or sulphur-substituted group having 1 to 8 carbon atoms or a heterocyclic group having up to 8 carbon atoms which may be unsubstituted or substituted with hydroxy, ether oxygen or sulphur, (b) mixtures of said first ethylenediamine compounds, and (c) mixtures of a first said ethylenediamine compound and a second ethylenediamine compound of the formula:
- ##STR11## wherein at least one R' group has the formula:
- ##STR12## wherein R.sub.1 is a branched or straight-chained aliphatic group having 3 to 8 carbon atoms, R.sub.2 is a branched or straight-chained aliphatic group having 1 to 8 carbon atoms, and the remaining R' groups are defined as for R, dissolved in a solvent.
A primer composition for the promotion of bonding of a first plastic substrate to a second substrate, the composition comprising a 0.01-0.75% solution in an organic solvent of a primer substance selected from the group consisting of (a) first ethylenediamine compounds having the formula:
- ##STR13## wherein each R, which may be the same or different, is hydrogen, an alkyl, alkenyl or alkoxy group having 1 to 8 carbon atoms, an aryl group having 6 to 8 carbon atoms, a nitrogen- or sulphur-substituted group having 1 to 8 carbon atoms or a heterocyclic group having up to 8 carbon atoms which may be unsubstituted or substituted with hydroxy, ether oxygen or sulphur, (b) mixtures of said first ethylenediamine compounds, and (c) mixtures of a said first ethylenediamine compound and a second ethylenediamine compound of the formula:
- ##STR14## wherein at least one R' group has the formula:
- ##STR15## wherein R.sub.1 is a branched or straight-chained aliphatic group having 3 to 8 carbon atoms, R.sub.2 is a branched or straight-chained aliphatic group having 1 to 8 carbon atoms, and the remaining R' groups are defined as for R.
Dependencies are inferred from the claim text.