Urea-formaldehyde (UF) resin composition for enhanced stability, tensile and tear strength before and after cure

摘要

The present invention provides aqueous urea formaldehyde resin (UF resin) compositions having a pH or 7.0 or more, preferably, 8.5 or more, and comprising the UF resin modified with from 2.5 to 15 wt. %, of at least one ammonia or volatile amine neutralized carboxylic acid group containing solution polymer or alkali soluble emulsion polymer modifier, based on total UF resin and polymer solids, wherein the polymer modifier is the reaction product of 30 to 100 wt. % of methacrylic acid, acrylic acid, maleic anhydride, a salt thereof, or mixtures thereof, wherein the solution polymer has a weight average molecular weight of from 2,000 to 16,000 and the alkali soluble emulsion copolymer has a weight average molecular weight of from 1,500 to 20,000. The compositions enable the provision of untreated glass mats having improved wet web strength to prevent mat breakage in process.

主权项

1. An aqueous urea formaldehyde resin (UF resin) composition having a pH or 7.0 or more and comprising the UF resin modified in a total polymer modifier amount of from 2.5 to 15 wt. %, based on total UF resin and polymer solids, of at least one ammonia or volatile amine neutralized carboxylic acid group containing polymer which is the reaction product of 30 wt. % or more of methacrylic acid, acrylic acid, maleic anhydride, a salt thereof, or mixtures thereof as a carboxylic acid group containing monomer, wherein the at least one ammonia or volatile amine neutralized carboxylic acid group containing polymer is chosen from a solution polymer having a weight average molecular weight of from 2,000 to 16,000 and alkali soluble emulsion copolymers (resins) having a weight average molecular weight of from 1,500 to 20,000.