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US 6,387,475 B1Granted
Water based adhesive composition with release properties
AssigneeNational Starch and Chemical Investment Holding Corporation
InventorsEdmund W. Figiel, Robert L. Billmers
Life of this patent
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Abstract
An aqueous adhesive composition with good release properties comprising a water based adhesive and a metal activated dicarboxylic acid anhydride starch derivative as release agent. This adhesive composition is useful in forming coreless paper rolls.
Claims20
An aqueous adhesive composition with good release properties comprising:
- a) a water soluble polymer having a viscosity of less than about 25,000 cPs at a temperature of about 22° C. and a solids of 10% or more by weight, and
- b) an effective amount of a release agent having the formula:
- where St is starch, R is dimethylene or trimethylene, R′ is a substituent hydrocarbon having 8 to 18 carbon atoms, M is a polyvalent metal and x is an integer equal to the valence of M.
A method for preparing an aqueous adhesive composition wherein:
- a) a water soluble polymer is dispersed in water,
- b) a substituted dicarboxylic acid anhydride starch derivative having the following formula is added to the starch solution:
- where St is the starch base material, R is a dimethylene or trimethylene group, R′ is s substituent hydrocarbon group having 8 to 18 carbon atoms, and Y is alkali metal or ammonium, and
- c) a polyvalent metal salt activator is added and dissolved in the solution.
1 more element
Dependencies are inferred from the claim text.