Polymeric adhesion promoter and latexes; and polymeric adhesion promoter, epoxy resins and latexes are used to improve adherence between various substrates
First Claim
1. An adhesive formulation for substrates which provides a bond between a substrate and a same or different substrate which consists essentially of:
- (i) a polymeric carboxylated styrene/butadiene latex;
(ii) at least one polymeric adhesion promoter present in an amount sufficient to promote adherence of the surface of a first substrate to the surface of the same or different substrate, and (iii) an epoxy emulsion in an amount sufficient to improve adherence of the surface of the first substrate to the surface of the same or different substrate under humid conditions;
whereby the adhesive formulation comprising (i), (ii) and (iii) provides an increase in percent retention between dry strength and wet strength of the bond over an adhesive formulation which does not comprise (i), (ii) and (iii).
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Accused Products
Abstract
The adhesive of the present invention includes latexes with an adhesion promoter which is preferably polyamidoamine. The addition of the polyamidoamine improves the adhesive strength between substrates such as between two plastic films or between a plastic film and paperboard. The present invention also provides for an adhesive prepared from a latex which is neutralized with a particular base and a hydrophobic polyamidoamine having particular amine values and viscosity whereby the strength of the adhesive bond is increased in humid conditions. The present invention also provides for adhesives primarily for use in laminate structures which are exposed to highly humid conditions. The adhesive is a polymeric latex based system to which a polymeric adhesion promoter like polyamidoamine and an epoxy emulsion are added. The adhesive retains bond strength when exposed to humidity. The scope of the invention also includes laminate structures prepared with the present adhesive and other substrate layered structures which utilize the adhesive.
33 Citations
10 Claims
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1. An adhesive formulation for substrates which provides a bond between a substrate and a same or different substrate which consists essentially of:
- (i) a polymeric carboxylated styrene/butadiene latex;
(ii) at least one polymeric adhesion promoter present in an amount sufficient to promote adherence of the surface of a first substrate to the surface of the same or different substrate, and (iii) an epoxy emulsion in an amount sufficient to improve adherence of the surface of the first substrate to the surface of the same or different substrate under humid conditions;
whereby the adhesive formulation comprising (i), (ii) and (iii) provides an increase in percent retention between dry strength and wet strength of the bond over an adhesive formulation which does not comprise (i), (ii) and (iii). - View Dependent Claims (2, 3, 4, 8, 9, 10)
- (i) a polymeric carboxylated styrene/butadiene latex;
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5. An adhesive formulation for substrates which provides a bond between a substrate and a same or different substrate which consists essentially of:
- (i) a polymeric carboxylated styrene/butadiene latex;
(ii) at least one polymeric adhesion promoter present in an amount sufficient to promote adherence of the surface of a first substrate to the surface of the same or different substrate and (iii) an epoxy emulsion in an amount sufficient to improve adherence of the surface of the first substrate to the surface of the same or different substrate under humid conditions, whereby the adhesive formulation comprising (i), (ii) and (iii) provides an increase in percent retention between dry strength and wet strength of the bond over an adhesive formulation which does not comprise (i), (ii) and (iii) and a surfactant whereby coagulation of the adhesive in water containing ions is inhibited. - View Dependent Claims (6, 7)
- (i) a polymeric carboxylated styrene/butadiene latex;
Specification