Patent ID: 6056816
Filing Date: 2000-05-02
Classification: C08L,C09J

Abstract:
A process for preparing an adhesive composition, comprising the steps of:(a) preparing a gelled carrier portion, by adding from 1.5 to 10% by weight of a starch, based on the weight of said adhesive composition, to 20 to 40% by weight of water, mixing to disperse the starch in the water, then adding from 0.25 to 2.5% by weight of NaOH or KOH and mixing to constant viscosity to produce the gelled carrier portion;(b) adding to said gelled carrier portion from 10 to 30% by weight of a water-soluble alkali metal silicate characterized by a molar ratio SiO.sub.2 :M.sub.2 O in the range from 1.5 to 4.0, where M is Na or K, then mixing the whole until substantially homogeneous;(c) adding a further 3 to 20% by weight of water and mixing until homogeneous; and(d) adding a further 2 to 25% by weight of starch and mixing until viscosity is substantially constant to produce a final adhesive composition having a solids content between 31.2% and 45% by weight.