Patent · US Expired

Dimensionally stable impression compositions

US4965295A · kind A · utility

14Cited by

7References

7Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Peter Schwabe · Leverkusen, DE
Ottfried Schlak · Cologne, DE
Gottfried Knispel · Leverkusen, DE
Reiner Voigt · Leverkusen, DE

Key dates

Filing date	Apr 12, 1989
Grant date	Oct 23, 1990
Priority date	—
Expiry date	Apr 12, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G77/20
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

In a silicone impression and duplicating composition which undergoes crosslinking at ambient temperature by an addition reaction, comprising (a) an organopolysiloxane possessing two or more vinyl groups in the molecule, (b) optionally an organopolysiloxane without reactive groups, (c) an organopolysiloxane possessing two or more Si-H groups in the molecule, (d) a catalyst, (e) a filler and, (f) optionally an auxiliary and/or colorant, the improvement wherein polysiloxane components (a)-(c) contain not more than about 1.5% by weight of volatile oligomers, whereby the dimensional stability of impressions is improved.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.