Patents by Inventor Helfried Ehrend

Helfried Ehrend 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).

  • Process for the cross-linking of halogenated polymers
    Patent number: 5250625
    Abstract: The cross-linking of halogenated polymers such as chlorinated polyethylene with bis-(2,5-dimercapto-1,3,4-thiadiazole) in the presence of a basic substance may easily be carried out and leads to improved properties of the vulcanisate, in particular when amidamines such as, for example, tetraethylene pentamine distearate are used as basic substances.
    Type: Grant
    Filed: April 16, 1991
    Date of Patent: October 5, 1993
    Assignee: Rhein Chemie Rheinau GmbH
    Inventor: Helfried Ehrend
  • Processing of polyurethane rubbers
    Patent number: 5141978
    Abstract: An addition of 1 to 10% by weight and preferably 2 to 5% by weight, based on polyurethane rubber, of a fatty acid ester of pentaerythritol or a mixture of an alkane with a fatty acid to the polyurethane rubber mix eliminates the tendency towards sticking and improves the flow properties.
    Type: Grant
    Filed: April 29, 1991
    Date of Patent: August 25, 1992
    Assignee: Rhein Chemie Rheinau GmbH
    Inventor: Helfried Ehrend
  • Process for crosslinking chlorinated polyethylene
    Patent number: 4551505
    Abstract: The crosslinking of chlorinated polyethylene with 2,5-dimercapto-1,3,4-thiadiazole in the presence of a basic substance may be carried out easily and leads to improved vulcanizate properties if amido amines, for example tetraethylene pentamine distearate, are used as the basic substances.
    Type: Grant
    Filed: September 25, 1984
    Date of Patent: November 5, 1985
    Assignee: Rhein-Chemie Rheinau GmbH
    Inventors: Michael Sauerbier, Helfried Ehrend
  • Use of cross-linked epoxidized fatty oils in vulcanizing polymers
    Patent number: 4524182
    Abstract: Epoxidized and subsequently cross-linked esters of alcohols which are at least dihydric and unsaturated fatty acids may be used as active processing substance in polymers, in particular elastomers, at higher temperatures, in particular at higher vulcanization temperatures, than "Factice". They may be produced by a particularly elegant one-shot reaction.
    Type: Grant
    Filed: February 21, 1984
    Date of Patent: June 18, 1985
    Assignee: Rhein-Chemie Rhein GmbH
    Inventors: Armin Bauer, Helfried Ehrend, Klaus Morche, Karl Nutzel, Michael Sauerbier