Starch-(meth)acrylate graft copolymer, oil-swellable material and oil- and water-swellable material comprising the same, and sealing articles and packers prepared from said swellable material
US8053509B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2006 |
| Grant date | Nov 8, 2011 |
| Priority date | — |
| Expiry date | Jun 14, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2200/0625
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a starch-(meth)acrylate graft copolymer and the preparation process thereof. The starch-(meth)acrylate graft copolymer is prepared by copolymerizing (meth)acrylate monomer and starch in a weight ratio of (0.4˜8):1, the graft copolymer having a skeleton of large starch molecule is grafted with one or more (meth)acrylate monomer with a grafting ratio of no less than 70%. The present invention further provides an oil swellable material, which comprises the starch-(meth)acrylate graft copolymer above as the swelling agent; and also an oil- and water-swellable material, which comprises the starch-(meth)acrylate graft copolymer above, water absorbing agent, reactive monomer, surfactant and material matrix. Further, sealing articles and packers prepared from the above oil swellable material and oil- and water-swellable material are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.