The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 1978
Filed:
Apr. 04, 1977
Kent S Dennis, Midland, MI (US);
Charles E Lyons, Midland, MI (US);
Corwin J Bredeweg, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
An improved resinous structure is disclosed. The structure has a transparent resinous matrix having a light absorbance (optical density) at 640 millimicrons wavelength which is not greater than 0.07 when the structure has a thickness of 10 mils. The continuous matrix polymer is a polymer of about 65 to 95 parts by weight of styrene and 5 to 35 parts by weight of methylmethacrylate. The structure contains a discontinuous phase of a diene rubber in a proportion of about 4 to 12 parts by weight. The rubber is present in the form of particles having an average diameter not exceeding 2 microns, the particles are of a cellular nature and principally of a closed-cell configuration. The cell walls of the particles are not greater than about 0.15 microns in thickness. The rubber particles contain, occluded therein, polymer of a composition generally identical to the matrix polymer. Such resinous bodies are transparent, impact resistant and suitable for many packaging applications.