Laminating adhesives using polyester from transesterification of polylactic acid with natural oils
AssigneeHenkel AG & Co. KGaA
InventorsGrant B. Kenion, Alexander P. Mgaya, Zhengmian Chang, Balasubramaniam Ramalingam
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Abstract
A specific mixture of polyols, at least one of which contains the transesterification product of the polymer polylactic acid with natural oils. The mixture of polyols can be used as one component of a two-component adhesive for laminating flexible packaging. The other component comprises an isocyanate-functionalized compound. The two components are combined before use and the resulting adhesive can be used to bond films to form a flexible packaging material.
Claims16
An isocyanate reactive component for reaction with an isocyanate functionalized component to form a two-component laminating adhesive, comprising:
- a transesterification product of a reaction mixture comprising polymeric polylactic acid and at least one natural oil;
- and
- a high OH functionality polyol product
- and wherein the reaction mixture comprises:
- polylactic acid present in an amount of from 50 to 85 weight percent based on a total weight of the reaction mixture;
- at least one natural oil present in an amount of from 13 to 30 weight percent based on the total weight of the reaction mixture;
- a diol present in an amount of from 2 to 36 weight percent based on the total weight of the reaction mixture;
- and optionally, a transesterification catalyst.
A two-component adhesive for laminating flexible packaging material including a Component A and a Component B, wherein:
- Component A comprises an isocyanate functionalized compound having two or more terminal isocyanate groups per molecule;
- and
- Component B comprises the isocyanate reactive component including a transesterification product of a reaction mixture comprising polymeric polylactic acid and at least one natural oil;
- and a high OH functionality polyol product.
Dependencies are inferred from the claim text.