Phenolic stain-resists
US5229483A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1992 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Apr 30, 2012 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06M15/412
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A stain-resist agent for polyamides fibers, its preparation and use are disclosed. The stain-resist agent is the condensation product of a phenolic of which at least 67 weight percent is bis-hydroxyphenylsulfone and the remainder p-cresol, p-phenolsulfonic acid or methyl-p-hydroxybenzoate, with from about 0.4 to 2.3 moles, per mole of the phenolic of a mercapto-substituted carboxylic acid selected from mercaptosuccinic acid, mercaptoacetic acid or mercaptopropionic acid; and about 1.4 to about 3.7 moles per mole of mercapto-substituted carboxylic acid of formaldehyde and sufficient base to neutralize all of the mercapto-substituted carboxylic acid groups and part but not all of the phenolic groups. The product contains about 3 to about 6 phenolic moieties with a molecular weight of 1500 to 2500 being preferred. Generally the reaction is carried out at reflux temperature (100.degree. to 103.degree. C.) for a period of 24 to 72 hours. Generally the stain-resist is applied to the polyamide fibers at a pH of 1.8 to 5.0 for a period of 1 to 60 minutes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.