Use of polypropylene glycol as a shrinkage-reducing additive in dispersion powder compositions for construction materials
US5498665A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1994 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Nov 23, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/34
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to the use of polypropylene glycol as a shrinkage-reducing additive in dispersion powder compositions for construction materials containing PA1 a) a base polymer from the group consisting of vinyl ester polymers, (meth)acrylate and/or styrene (co)polymers and vinyl chloride polymers, and PA1 b) either PA2 b1) 2 to 20% by weight, based on the base polymer, of polyvinyl alcohol having a degree of hydrolysis of 85 to 94 mol % and a Hoppler viscosity of 2 to 40 mPa.s or PA2 b2) 2 to 20% by weight, based on the base polymer, of alkali metal salts or alkaline earth metal salts of phenolsulfonic acid-formaldehyde condensation products, and PA1 c) 3 to 30% by weight, based on the total weight of polymeric components, of fine antiblocking agents, wherein PA1 d) the content of polypropylene glycol is 1 to 20% by weight, based on the base polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.