Extruded fragrance-containing polyvinyl alcohol and use thereof
US5543439A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1995 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Feb 24, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D17/0056
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Described is a composition of matter particularly useful in fabricating toilet rim blocks consisting of: PA1 (a) extruded polyvinyl alcohol or partially hydrolyzed polyvinyl acetate with the maximum mole ratio of acetyl moiety:hydroxyl moiety being about 3:1 having a number average molecular weight of from about 15,000 up to about 68,000 containing 0 up to about 13% by weight of plasticizer; PA1 (b) from about 1 up to about 20% by weight of a compatible fragrance contained within the polyvinyl alcohol or partially hydrolyzed polyvinyl acetate; PA1 (c) from 0 up to about 20% by weight of a "foaming agent" which is a first surfactant and which can be a detergent, contained within the polyvinyl alcohol or partially hydrolyzed polyvinyl acetate; PA1 (d) from 0 up to about 20% by weight of a hydrophobic silica contained within the polyvinyl alcohol or partially hydrolyzed polyvinyl acetate; PA1 (e) from 0 up to about 20% by weight of at least one second surfactant in addition to the "foaming agent"; PA1 (f) from 0 up to about 5% by weight of a water soluble dye; and PA1 (g) from 0 up to about 4% by weight of a "foam booster". Also described are processes for preparing such compositions …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.