Pulverulent copolyamides for the coating of glass bottles
US4172161A · kind A · utility
6Cited by
11References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1977 |
| Grant date | Oct 23, 1979 |
| Priority date | — |
| Expiry date | Jul 13, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31765
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An improved method of coating glass bottles by flame spraying with pulverulent copolyamides which uses a copolyamide containing at least 30% by weight of laurolactam. The copolyamides, obtained by the hydrolytic polycondensation process are first subjected to a molecule-orienting treatment, then ground into powders at low temperatures, and these powders are sifted to a particle size distribution so that the proportion of powder having a particle size of between 30 and 100 microns is greater than 70 to 100%, and the proportion of powder having a particle size of less than 30 microns is 0 to 30%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.