FIELD: chemistry.
SUBSTANCE: intermediate layer is formed from polyvinylbutyral, containing relatively rigid polyvinylbutyral internal layer between two relatively soft external polyvinylbutyral layers, where difference in rigidity is set by difference in concentration of plasticiser, which to significant extent is determined by difference in content of residual hydroxyl groups in polyvinylbutyral layers.
EFFECT: invention ensures high shock resistance as protection against hurricanes or in bulletproof glass.
10 cl, 2 dwg, 2 tbl
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