Patent ID: 11973155
Assignee: DAI NIPPON PRINTING CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC H  B  Y | IPC B  H

Claim 0:
1. A sealing material sheet for a solar-cell module, the sealing material sheet comprising:
a core layer containing a polyethylene-based resin; and
a skin layer formed as a top-most surface of the sealing material sheet, and containing a polyethylene-based resin and a silage-modified polyethylene-based resin,
wherein:
a density of the core layer is greater than a density of the skin layer,
a graph representing a linear expansion coefficient of the sealing material sheet as a function of a resin temperature as measured according to JIS K 7197 includes two inflection point temperatures at which a change rate of the linear expansion coefficient increases:
a first inflection point temperature within a range of 55° C. to 70° C., and
a second inflection point temperature within a range of 80° C. to 95° C.,

the change rate of the linear expansion coefficient from the first inflection point temperature to a temperature +3° C. the first inflection point temperature is larger than the change rate of the linear expansion coefficient from a temperature −3° C. the first inflection point temperature to the first inflection point temperature,
the change rate of the linear expansion coefficient from the second inflection point temperature to a temperature +3° C. the second inflection point temperature is larger than the change rate of the linear expansion coefficient from a temperature −3° C. the second inflection point temperature to the second inflection point temperature.