Transparent polyvinyl butyral sheet and process for the manufacture thereof
AssigneeHoechst Aktiengesellschaft
InventorsHans D. Hermann, Albrecht Harreus
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Abstract
The tendency to blocking of polymer sheets can be reduced by means of anti-blocking agents. Suitable anti-blocking agents in transparent polyvinyl butyral sheets are especially montanic acid esters, which do not adversely affect the adhesion of the sheet to glass. The polyvinyl butyral sheets are used as interlayers of laminated glass (safety glass).
Claims20
An interlayer for laminated glass comprising a plasticizer-containing polyvinyl butyral, and from 0.05 to 1 weight % (relative to the plasticizer-containing polyvinyl butyral) of a montanic acid ester, wherein the ester is a diester or a triester.
A process for the manufacture of a an interlayer for laminated glass by thermoplastic processing of a plasticizer-containing polyvinyl butyral in the presence of an anti-blocking agent under conditions know per se, which comprises using a montanic acid diester or triester in an amount of 0.05 to 1 weight %, relative to the plasticizer-containing polyvinyl butyral, as anti-blocking agent.
Dependencies are inferred from the claim text.