Polymeric films
US4954393A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Apr 21, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/676
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
This invention provides multilayer polymeric films including a layer of nylon polymer having a Vicat A(DIN 53460) softening point of not more than 170.degree. C. and being substantially impermeable to styrene, and a layer of a weldable synthetic plastics composition bonded to the layer of the nylon polymer. Such films can be used to recondition pipes, for example sewer pipes. They have the advantage of being resistant to swelling by synthetic resin compositions, particularly styrene, used to impregnate a fibrous mat which is bonded to the film when used to recondition pipes. In addition, the films have shown resistance to puncturing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.