Formaldhyde-free compositions for nonwovens
US5932689A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1998 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | Apr 22, 2018 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD04H1/64
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A formaldehyde-free curable composition useful for binding nonwovens comprises PA1 (a) a polyacid comprising at least two carboxylic acid groups, anhydride groups, or salts of the polyacid thereof; PA1 (b) an active hydrogen compound containing at least two active hydrogen groups selected from the group consisting of hydroxyl, primary amino, secondary amino, and mixtures thereof; and PA1 (c) one or more compounds selected from the group consisting of cyanamide, dicyandiamide, 1,2-mono- or di-(C.sub.1 -C.sub.6 alkyl) substituted-3-cyanoguanidines such as ethyl-3-cyanoguanidine, 1,2-diethyl-3-cyanoguanidine, and 1,2-diisopropyl-3-cyanoguanidine, and 1,2-mono- or di-(C.sub.6 -C.sub.12 aryl) substituted-3-cyanoguanidines, such as phenyl-dicyandiamide; and, optionally PA1 (d) an accelerator; wherein the ratio of the number of equivalents of said carboxylic acid groups, anhydride groups, or salts thereof to the number of equivalents of said active hydrogen groups is from 1/0.01 to about 1/3, and wherein said carboxylic acid groups, anhydride groups, or salts thereof are neutralized to an extent of less than 35% by weight with a fixed base. The accelerator may be a phosphorus and/or fluor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.