Patents by Inventor Dieter Hepp

Dieter Hepp has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Use of di-(cyclohexylethylmethylol) phthalates or di-(ethylcyclohexylmethylol) phthalates as plasticizers for polyvinyl chloride
    Patent number: 4231915
    Abstract: In a method of plasticizing polyvinyl chloride by adding a plasticizer to polyvinyl chloride, an improvement is provided wherein the plasticizer is a di-(cyclohexylethylmethylol) phthalate or a di-(ethylcyclohexylmethylol) phthalate of the formula ##STR1## wherein R is ethyl or hydrogen; R.sub.1 is methyl or hydrogen; and n is an integer of 0-2; and when n is 2, R is H and R.sub.1 is H; when n is 0, R is ethyl and R.sub.1 is H, and when n is 1, R.sub.1 is methyl and R is H; the two alcohol radicals being the same or different.
    Type: Grant
    Filed: April 4, 1979
    Date of Patent: November 4, 1980
    Assignee: Chemische Werke Huls Aktiengesellschaft
    Inventors: Manfred Kaufhold, Dieter Hepp, Gerhard Menzel