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:
May. 19, 1998
Filed:
Jul. 05, 1996
Dainichiseika Color & Chemicals Mfg. Co., Ltd., Tokyo, JP;
Abstract
A process for producing non-scattering hollow plastic balloons which comprises: (a) heating a mixture (A) of non-foamed plastic balloons and a first wetting agent, which is a plasticizer, to a temperature from 40.degree. C. to a temperature which is 40.degree. C. below an exit temperature of a heat exchanger, (b) contacting the mixture (A) with a second wetting agent being heated to a temperature equal to or above the foaming starting temperature of the non-foamed plastic balloons, wherein a ratio of the mixture (A) to the second wetting agent (B) is 1:0.5 to 1:1.5, the contacting being within 1 minute after heating the mixture (A) by the heat exchanger to a temperature ranging from 20.degree. to 50.degree. C. below the foaming starting temperature of the non-foamed plastic balloons, (c) foaming the non-foamed plastic balloons, and (d) cooling the resultant mixture from step (c) containing the foamed plastic balloons. Non-scattering foamed plastic balloons can thus be obtained simultaneously with the foaming. The present process needs a smaller amount of a plasticizer than the conventional process of wetting foamed plastic balloons with a plasticizer.