Nonagglomerating antifoamants
US5681692A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1996 |
| Grant date | Oct 28, 1997 |
| Priority date | — |
| Expiry date | Feb 2, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/047
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a solution for forming silver halide emulsions comprising water, a gelatin containing less than 30 micromoles of methionine per gram of gelatin, and at least one antifoamant selected from the group consisting of RCO.sub.2 (CH.sub.2 CH.sub.2 O).sub.x OCR (I) wherein RC and CR represent the carbon chain in carboxylic acids with chain lengths of predominantly 12-18 carbon atoms, x has a mean value of 4 to 5 from a mixture with a distribution of values between 2 and 7, and (H.sub.3 CSi) (OSi (CH.sub.3).sub.2).sub.d O-- (CH.sub.2 CH.sub.2 CH.sub.2 O--).sub.n C.sub.4 H.sub.9 !.sub.3 (II) wherein the molecular weight is 2500 to 3500 and d and n have average values of less than 15.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.