Ink retaining foam structure
US6596785B2 · kind B2 · utility
2Cited by
27References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 17, 2001 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Jul 30, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2110/0083
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An ink retaining flexible polyurethane foam is prepared by reacting a polyether polyol with from 50 to 80 parts by weight, based on the weight of polyol, of a polyisocyanate component having one or a mixture of methylene diisocyanates. The foam has pore sizes above 70 pores per linear inch, preferably in the range of 70 to 90 pores per linear inch in an uncompressed state. The foam is reticulated to improve liquid holding capacity, and, depending upon cell size, compressed into a container. The foam absorbs and retains ink, and is resistant against attack from ink, producing less than 2.0% solvent extractables.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.