Patent ID: 8758533
Filing Date: 2014-06-24
Classification: B29B,C08J,C09J,Y10T

Abstract:
1. A process for foaming a water-based adhesive comprising the steps: a. providing a water-based adhesive, wherein the water-based adhesive is an aqueous polymer solution or dispersion held at room temperature and at a pressure 0.59 atm greater than ambient pressure; b. adding and mixing 5-30 wt %, based on the total weight of the adhesive, of a first reagent, which is a metal carbonate or an ammonium carbonate, or the corresponding hydrogen carbonates, or a mixture of those carbonates and/or those hydrogen carbonates, into the adhesive; c. adding and mixing a second reagent, which is an organic or inorganic acid, or acidic salt, into the adhesive at a pressure higher than steps (a) and (b); wherein the reaction from the first reagent and the second regent forms carbon dioxide gas, and the gas is divided between a vapour phase and a liquid phase, and in which the gas remains dissolved without formation of bubbles within the liquid phase; and d. releasing the adhesive at an ambient pressure, causing the adhesive to foam.