Polyvinyl butyrals having improved thermal stability and light r

Details Polyvinyl butyrals having improved thermal stability and light r Polyvinyl butyrals having improved thermal stability and light r

1993-05-06

1995-01-24

Hoke, Veronica P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

428437, 514180, 514303, 514304, 514291, 514193, 514194, 514392, C08K 558, C08K 537, C08K 53435

Patent

active

053843460

ABSTRACT:
Polyvinyl butyrals (PVBs) with improved thermal stability and improved light resistance contain as stabilizers polynuclear phenols which phenolic radicals have a quaternary carbon atom in the para-position to the phenolic hydroxyl group and if desired in combination with synergistically acting, nitrogen-containing, sulfur-containing or phosphorus-containing co-stabilizers of the types a) to d). The use of the resulting films of low yellowness as interlayer films having substantially reduced yellowing for the production of laminated glasses and glass composites of silicate glass sheets is described.

REFERENCES:
patent: 3402139 (1968-09-01), Mont et al.
patent: 3422059 (1969-01-01), Taylor et al.
patent: 3455875 (1969-07-01), Mauz et al.
patent: 3577384 (1971-05-01), Mauz et al.
patent: 3646110 (1972-02-01), Eggensperger et al.
patent: 3823113 (1974-07-01), Reisman
patent: 3950305 (1976-04-01), Schmidt
patent: 4704418 (1987-11-01), Gomez
patent: 5190826 (1991-05-01), Asahina et al.

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