Multilayered biaxially-oriented styrene based resin sheet and me

Details Multilayered biaxially-oriented styrene based resin sheet and me Multilayered biaxially-oriented styrene based resin sheet and me

1999-02-17

2000-11-28

Thibodeau, Paul

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428910, 428213, B32B 2708

Patent

active

061533084

ABSTRACT:
A multilayered biaxially-oriented styrene based resin sheet comprises; a styrene based resin layer (A) as at least two outer layers formed by the polymerization of methacrylic acid in a weight proportion of 1-3.5% and styrene, and a styrene based resin layer (B) formed from polystyrene which is sandwiched between the outer layers and for which the loss tangent (tan .delta.) maximum peak value temperature for dynamic viscoelasticity measurement is 6.5-25.degree. C. lower than that for the resin of the resin layer (A). The sheet has excellent properties of transparency and external appearance, can be reused by recovering and moreover does not suffer from raindrop occurrence by secondary forming.

REFERENCES:
patent: 3791916 (1974-02-01), Eastes
patent: 4011357 (1977-03-01), Haase
patent: 5162137 (1992-11-01), Placek
patent: 5474855 (1995-12-01), Antheunisse

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