GLUE COMPOSITION Russian patent published in 2015 - IPC C09J193/04 C09J145/02 C09J195/00 

FIELD: chemistry.

SUBSTANCE: glue composition by invention contains indene-coumarone resin, rosin, bitumen, pine pitch, talc and graphite with the following component ratio, wt %: indene-coumarone resin 24.0; rosin 21.0; bitumen 6.5; pine pitch 2.0; talc 40.5; graphite 6.0. Thereof application makes it possible to produce lenses with diameter to 150 mm with thin edge and thin centre. Ratio of lens curvature radius to diameter R/D≥0.5 with accuracy N=2, ΔN=0.2.

EFFECT: creation of plastic glue composition with small shrinkage at heating with the following cooling.

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