Thermoplastic molding compositions of polyvinylbutyral containing plasticizer
AssigneeHoechst Aktiengesellschaft
InventorsHans D. Hermann, Klaus Fabian
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Abstract
Thermoplastic molding compositions comprising 65-80% by weight (based on the molding composition) of a polyvinylbutyral which preferably contains 19-28% by weight (based on the polyvinylbutyral) of vinyl alcohol units, and 35-20% by weight (based on the molding composition) of a plasticizer mixture of 50-99% by weight (based on the plasticizer mixture) of a di-, tri- or tetra-glycol diester and 50-1% by weight (based on the plasticizer mixture) of a phosphoric acid triester. The preparation of the molding compositions by mixing the constituent components and their use for the production of shaped thermoplastic articles, in particular high-strength films for use as the bonding intermediate layer in the production of laminated glass.
Claims8
A thermoplastic molding composition based on polyvinylbutyral containing plasticizer, comprising a component mixture of
- (A) 65-80% by weight, based on the component mixture, of a polyvinylbutyral containing vinyl alcohol units and
- (B) 35-20% by weight, based on the component mixture, of a plasticizer mixture of
- (a) 50-99% by weight, based on the plasticizer mixture, of a glycol ester of formula I ##STR4## in which R.sub.1 and R.sub.2, which can be identical or different, denote aliphatic radicals with in each case 4-10 carbon atoms and n denotes an integer from 2 to 4, and
- (b) 50-1% by weight, based on the plasticizer mixture, of a phosphoric acid ester of formula II ##STR5## in which R.sub.3, R.sub.4 and R.sub.5, which can be identical or different, denote aliphatic radicals which have in each case up to 18 carbon atoms, optionally contain double bonds and/or optionally contain hetero-atoms and/or optionally contain halogen atoms and can also be substituted, and R.sub.4 and/or R.sub.5 can also denote cycloaliphatic, aromatic or araliphatic radicals with in each case up to 18 carbon atoms.
A high strength polyvinylbutyral film of a thermoplastic composition which consists essentially of (A) polyvinylbutyral containing vinyl alcohol units and (B) a plasticizer mixture,
- wherein the film comprises from 65 to 80% by weight of (A) and the remaining 35 to 20% by weight of (B),
- wherein from 50 to 99% by weight of (B) is glycol ester of formula I:
- ##STR6## in which each of R.sub.1 and R.sub.2 is, independently, an aliphatic radical with from 4 to 10 carbon atoms and
- n is 2, 3 or 4, and
- wherein the remaining 50 to 1% by weight of (B) is phosphoric acid ester of formula II:
- ##STR7## in which R.sub.3 is an aliphatic radical with up to 18 carbon atoms and which optionally contains one or more (a) double bonds, (b) hetero atoms, (c) halogen atoms and/or (d) other substituents, and
- each of R.sub.4 and R.sub.5 is, independently, one of the meanings of R.sub.3, a cycloaliphatic radical, an aromatic radical or an araliphatic radical, in each case with up to 18 carbon atoms.
Dependencies are inferred from the claim text.