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:
Sep. 12, 1989
Filed:
Nov. 05, 1987
Beverly M White, West Boxford, MA (US);
Colloids, Inc., Marietta, GA (US);
Abstract
A new method for internally strengthening products formed from fibrous materials and the resulting products are provided. The method is characterized by the use of a wet-end additive and specifically a particular grade of polyvinyl alcohol which is super-hydrolyzed and which is substantially insoluble in water maintained at 130 degrees Fahrenheit. In addition, the polyvinyl alcohol particles have an extremely high hydrated bulk volume so that they form a highly stable suspension in water and which aids in achieving high retention of the particles in the web of the resulting product. The products formed by the method as described exhibit substantial improvements in strength properties.