Isocyanate-based laminating adhesives
AssigneeH. B. Fuller Licensing & Financing, Inc.
InventorBrian S. Glasbrenner
Life of this patent
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Abstract
The invention relate to a method of laminating flexible packaging, articles of manufacture and bonded laminates. The method comprises employing a laminating adhesive comprising an isocyanate-based composition comprising the reaction product of at least one polymeric polyol (part A) comprising the reaction product of at least one alkylene diol at least one diol; containing a pendant aliphatic chain; and at least one dicarboxylic acid; with at least one NCO terminated polyurethane prepolymer (part B) comprising the reaction product of at least one polyether polyol; and at least one polyisocyanate. The low viscosity laminating adhesive has enhanced processing characteristics at reduced temperature.
Claims21
A method of laminating flexible packaging comprising the steps of:
- a) providing a laminating adhesive comprising an isocyanate composition comprising the reaction product of:
- i) at least one polymeric polyol (part A) comprising the condensation product of:
- 1) at least one alkylene diol having a hydroxyl number in a range of from about 950 to about 1250;
- 2) at least one diol containing a pendant aliphatic chain having a hydroxyl number in a range of from about 950 to about 1250;
- and
- 3) at least one dicarboxylic acid;
- with
- ii) at least one NCO-terminated polyurethane prepolymer (part B) comprising the reaction product of:
- 1) at least one polyether polyol;
- and
- 2) at least one polyisocyanate;
- wherein the equivalence ratio of hydroxyl component (part A) to isocyanate component (part B) is in a range of from about 1.0:1.2 to about 1.0:1.6;
- and said parts are blended together to form a laminating adhesive having an initial viscosity less than about 25,000 mPa·s at 25 C.+/−5 C.;
- b) providing at least one first flexible substrate;
- c) applying a layer of said adhesive to a surface of at least one portion of said first substrate;
- d) contacting the adhesive coated surface portion of first substrate with at least a portion of the surface of a second substrate;
- and
- e) allowing the said adhesive to bond the first and second substrate together.
A film laminate comprising a pair of flexible film substrates bonded with a laminating adhesive comprising an isocyanate composition comprising the reaction product of:
- a) at least one polymeric polyol (part A) comprising the condensation product of:
- i) at least one [linear] alkylene diol having a hydroxyl number in a range of from about 950 to about 1250;
- ii) at least one diol containing a pendant aliphatic chain having a hydroxyl number in a range of from about 950 to about 1250;
- and
- iii) at least one dicarboxylic acid;
- with
- b) at least one NCO-terminated polyurethane prepolymer (part B) comprising the reaction product of:
- i) at least one polyether polyol;
- and
- ii) at least one polyisocyanate;
- wherein the equivalence ratio of hydroxyl component (part A) to isocyanate component (part B) is in a range of from about 1.0:1.2 to about 1.0:1.6;
- and said parts are blended together to form a laminating adhesive having an initial viscosity less than about 25,000 mPa·s at 25° C.+/−5.0° C.
A bonded assembly comprising at least a pair of substrates adhesively bonded with a laminating adhesive comprising:
- a) at least one polymeric polyol (part A) comprising the condensation product of:
- 1) at least one alkylene diol having a hydroxyl number in a range of from about 950 to about 1250;
- 2) at least one diol containing a pendant aliphatic chain having a hydroxyl number in a range of from about 950 to about 1250;
- and
- 3) at least one dicarboxylic acid;
- with
- b) at least one NCO-terminated polyurethane prepolymer (part B) comprising the reaction product of:
- 1) at least one polyether polyol;
- and
- 2) at least one polyisocyanate;
- wherein the equivalence ratio of hydroxyl component (part A) to isocyanate component (part B) is in a range of from about 1.0:1.2 to about 1.0:1.6;
- and said parts are blended together to form a laminating adhesive having an initial viscosity less than about 25,000 mPa·s at 25 C +/−5 C.
An article of manufacture comprising:
- a) at least one flexible substrate;
- b) at least one joint between a section of said substrate and another section of said substrate and another section of same or different substrate;
- and
- c) a layer of laminating adhesive comprising an isocyanate composition comprising the reaction product of:
- i) at least one polymeric polyol (part A) comprising the condensation product of:
- 1) at least one alkylene diol having a hydroxyl number in a range of from about 950 to about 1250;
- 2) at least one diol containing a pendant aliphatic chain having a hydroxyl number in a range of from about 950 to about 1250;
- and
- 3) at least one dicarboxylic acid;
- with
- ii) at least one NCO-terminated polyurethane prepolymer (part B) comprising the reaction product of:
- 1) at least one polyether polyol;
- and
- 2) at least one polyisocyanate;
- wherein the the equivalence ratio of hydroxyl component (part A) to isocyanate component (part B) is in a range of from about 1.0:1.2 to about 1.0:1.6;
- and the laminating adhesive has an initial viscosity less than about 25,000 mPa·s at 25 C+/−5 C.
Dependencies are inferred from the claim text.