Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1988-09-29
1989-10-31
Page, Thurman K.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428 34, 428178, 428212, 428913, 156 99, 156100, 427162, 427164, 427165, 427331, 4273722, 350266, 350312, 350353, B32B 300
Patent
active
048776750
ABSTRACT:
In greenhouses and other stuctures an excessive amount of sunlight on a hot day may cause overheating or may cause uneven lighting. A sheet is provided which is normally transparent but which becomes white and light-reflective at a predetermined temperature to help keep the structure cooled or help keep its lighting at a constant level. This color is reversible so that the sheet becomes transparent when the temperature falls. In one embodiment, the sheet consists of a unitary transparent plastic resin structure formed with elongated cells which are filled with a thick and viscous gel containing poly (vinyl methyl ether) or other suitable "cloud point" material. The gel helps prevent loss of water through the cell walls and prevents gaps which may occur from migration over repeated cycles of precipitation of the cloud point material, i.e., it helps keep the mixture homogeneous. In another embodiment the sheet comprises a plastic resin film which is coated with a liquid mixture including bentonite and a water solution of poly (vinyl methyl ether) and the mixture is dried and later re-wetted at the assembly site.
REFERENCES:
patent: 3953110 (1976-04-01), Chahroudi
patent: 3987781 (1976-10-01), Nozik et al.
patent: 4260225 (1981-04-01), Walles
patent: 4307942 (1981-12-01), Chahroudi
patent: 4772506 (1988-09-01), Siol et al.
Delano Richard
Falicoff Waqidi
Raseman Chad J.
Gerber Eliot S.
Page Thurman K.
Ryan P. J.
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