Light stabilized polyamide substrate and process for making
US5618909A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1995 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Jul 27, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/3435
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A dyed or undyed polyamide substrate, preferably film, fiber, or an article manufactured therefrom, with excellent breaking strength retention and ultimate elongation retention, is prepared by reacting a sufficient number of amine and/or amide-forming functional groups of a hindered amine with the end groups of the polyamide precursor(s) at a temperature sufficient for polymerization to occur, to thereby bind the hindered amine to the polyamide and inhibit migration, leaching, and volatilization of the hindered amine. The hindered amine is represented by the formula: ##STR1## in which R.sub.1 comprises the amine or amide-forming functional group; PA1 R.sub.2 is alkyl; and PA1 R.sub.3 is selected from the group consisting of hydrogen; alkyl of 1 to 3 carbons; and --OR.sub.4 in which R.sub.4 is selected from the group consisting of hydrogen, methyl, and alkyl of 1 to 7 carbons. The light stabilized polyamide substrate has particular utility in flags, decorative banners, and personal flotation device covers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.