Multilayer carrier films
US4861654A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1987 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Nov 13, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/674
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention is concerned with a multilayer carrier film for supporting a fluid synthetic resin composition impregnated fibrous mat against a surface, for example the inside surface of a pipe, during the curing of the resin. The film comprises a nylon layer (preferably nylon 6) having on one surface a layer of a polyamide copolymer having a softening point at a temperature below 170.degree. C. (for example a nylon 6/12 copolymer in which the nylon 12 component lies in the range from 35 to 55% by weight) and on the other surface a layer of a weldable synthetic plastic composition, for example a polyethylene ionomer. The fibrous mat which may consist of polyester, acrylic or polypropylene fibres is heat-bonded to the polyamide copolymer layer of the multilayer film. The film is resistant to delamination by the resin composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.