| 摘要 |
<p>PCT No. PCT/GB91/00700 Sec. 371 Date Dec. 3, 1991 Sec. 102(e) Date Dec. 3, 1991 PCT Filed May 1, 1991 PCT Pub. No. WO91/17202 PCT Pub. Date Nov. 14, 1991.A water soluble, or water dispersible, polymeric film comprising a layer of a first polymer resistant to dissolution and/or softening on handling with wet hands, and a layer of a second polymer resistant to insolubilization in water by perborate ions. Such films have a variety of uses particularly when they have a layer of an at least cold water soluble polymer between the layers of the said first and second polymers, for example in the packaging log washing products or agrochemicals. The first polymer layer is preferably discontinuous so that in the large body of water the film has reduced strength so that water can pass through the film when the film is agitated in the water.</p> |
