The Dow Chemical Company

Ashok C Makati

Do I Lee

Mezzie L Ash

Robert T Iwamasa

Charles S Kan

Bettye W Greene

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.

Polymeric adhesion promoter and latexes; and polymeric adhesion

An in-situ tackified structured latex the particles of which have at least two polymeric phases, a first phase (adhesive phase) comprising a polymer having a Tg of from about -70.degree. C. to about -5.degree. C. and a second polymeric phase comprising a polymer compatable with the first polymeric phase, having a molecular weight less than 5,000 and a Tg from about -15.degree. C. to about +50.degree. C. The latex is particularly suited for use as a single component adhesive.

In-situ tackified structured latex composition

A latex based adhesive comprising a first component (adhesive component) comprising an interpolymer of at least one hard monomer, at least one soft monomer, and optionally a copolymerizable carboxylic acid comonomer having a Tg of from about -70.degree. C. to about -5.degree. C. and a second polymeric component (tackifier component) that is compatible with the adhesive component having a molecular weight less than 5,000 and a Tg from about -10.degree. C. to about 50.degree. C., both the adhesive component and tackifier component having been separately prepared by emulsion polymerization techniques.

Latex based adhesive prepared by emulsion polymerization

A process for preparing a structure reinforced latex particle whose film has improved tensile and elongation properties prepared by an emulsion polymerization comprising a three-stage monomer feed addition. The second monomer feed is an amount form about 5 to about 30 parts per hundred parts monomer in said latex particle and is a polymer of which would have a T.sub.g greater than either the first or third monomer feed. The subject structure reinforced latex particle provides A film having improved tensile properties without a corresponding reduction in elongation. A pressure sensitive adhesive formulated with the structure reinforced latex particle is also provided.

Structure reinforced latex particles

A process for preparing a structure reinforced latex particle whose film has improved tensile and elongation properties prepared by an emulsion polymerization comprising a three-stage monomer feed addition. The second monomer feed is an amount from about 5 to about 30 parts per hundred parts monomer in said latex particle and is a polymer of which would have a T.sub.g greater than either the first or third monomer feed. The subject structure reinforced latex particle provides a film having improved tensile properties without a corresponding reduction in elongation. A pressure sensitive adhesive formulated with the structure reinforced latex particle is also provided.

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Midland, MI, United States of America

Ashok C Makati