Transparent antiballistic article and method for its preparation
US9821536B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2013 |
| Grant date | Nov 21, 2017 |
| Priority date | — |
| Expiry date | Oct 29, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2571/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
This invention relates to a process for the preparation of an antiballistic article, the method comprising: a) Providing a transparent uniaxially stretched polymeric film with at least one layer I comprising a semi-crystalline thermoplastic polymer A and at least one layer II comprising an amorphous or semi-crystalline thermoplastic polymer B, of which polymer B has a glass transition temperature less than the melting temperature of polymer A if polymer B is amorphous or of which polymer B has a melting temperature less than the melting temperature of polymer A if polymer B is semi-crystalline; b) Stacking at least two of the uniaxially stretched polymeric films of a) at an angle a of between 45° and 135°, such that the films are in contact with each subsequent film through at least one layer II, to form an assembly; c) Compressing the thus formed assembly at a temperature above the glass transition temperature of polymer B if polymer B is amorphous, or above the melting temperature of polymer B if polymer B is semi-crystalline, and below the melting temperature of polymer A, to obtain an haze of at most 50% and having an energy absorption for 17 grain FSP according to the STANAG 2…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.