The Perkin-elmer Corporation

Ppg Industries, Inc.

Simon Babil

Andrew R Muir

James A Claar

Rodger G Temple

An apparatus for automatically scaling an X-Y recorder for use with a thermal analyser wherein temperature range span during an experiment may be plotted exactly scaled to an abscissa such that the left side of the graphical representation corresponds exactly to the minimum temperature during the experiment and the right side of the representation corresponds exactly to the maximum temperature achieved.

Automatic recorder abscissa scaling

A system for use in thermal analysis for correcting discrepancies between oven temperature and desired sample temperature including means for automatically calibrating the system at several selected points in the analytical temperature scale wherein actual sample temperature is forced to agree exactly with desired sample temperature by appropriately changing oven temperature and wherein the calibrated sample temperature and the difference between oven temperature and sample temperature at the several points are used to correct for discrepancies throughout the intervening analytical temperature scale.

Automatic temperature calibration of thermal analyzers

Microcapsules are produced in-situ in a film or during the manufacturing process of a water-based coating composition from which the film is formed. A principal process involves the in-situ production of void-containing microcapsules in a film formed from a water-based coating. This principal process involves as a first step the preparation of a polymer composition which may be a homogeneous solution containing a water-immiscible organic polymer, a water-immiscible solvent for the polymer, and a water-immiscible lower volatility non-solvent which is miscible with the solvent; or an emulsion containing as the continuous phase a water-immiscible organic polymer dissolved in a water-immiscible solvent for the polymer and, as the discontinuous phase, droplets of a lower volatility non-solvent dispersed in the continuous phase. This polymer composition is then emulsified under agitation and in the presence of a surfactant into a water-based coating composition. The water-based coating composition containing this emulsified polymer composition is then applied to a substrate and the solvent is evaporated from the polymer composition to produce microcapsules containing discrete droplets of the non-solvent. Subsequent drying of the water-based coating and evaporation of the non-solvent from the microcapsules produces a film having incorporated therein structured, closed-cell, void-containing microcapsules with the voids serving to provide opacity and gloss control to the film. In an alternative to the principal process, microcapsules containing the non-solvent are produced in-situ in the water-based coating composition prior to forming a film therefrom.

Growing community of inventors

Trumbull, CT, United States of America

Simon Babil