Thermal transfer printing dyesheet and backcoat composition therefor
US4950641A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1988 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Oct 26, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31855
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
For a thermal transfer dyesheet, a protective backcoat is provided by polymerizing acrylic functional groups in a composition comprising: an organic resin comprising at least one polyfunctional material having a plurality of pendant or terminal acrylic groups per molecule available for cross-linking, at least 10% by weight of the polyfunctional material having 4-8 such acrylic groups per molecule; at least one linear organic polymer soluble or partially soluble in the resin, and comprising 1-40% by weight of the resin/polymer mixture; a slip agent selected from derivatives of long chain carboxylic or phosphoric acids, long alkyl chain esters of phosphoric acid, and long alkyl chain acrylates; an antistatic agent soluble in the resin, and a solid particulate antiblocking agent less than 5 .mu.m in diameter. Resins having predominently 5-7 acrylic functional groups per molecule, are preferred for enhancing protection against the thermal head, especially when used in a mixture also containing molecules having only 2-4 such acrylic groups per molecule. The effect of using such mixtures to cross link molecules of both high and low acrylic functionalities in the presence of the linear po…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.