Patents by Inventor Christiaan G. de Vrieze

Christiaan G. de Vrieze 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 addition of additives to thermoplastics
    Patent number: 3988285
    Abstract: The invention is directed to a method for the addition of additives, for instance, heat-stabilizers, anti-oxidants, UV-stabilizers, internal or external lubricants, antistatic agents, antiblocking agents, corrosion-inhibitors, and the like, to thermoplastics, by melting the additive in mineral oil to form a melt and then adding the melt to the processing of thermoplastic resins. By mixing additives with the mineral oil, the additives may be melted or dissolved in the mineral oil at temperatures less than the melting point of said additives.
    Type: Grant
    Filed: March 4, 1975
    Date of Patent: October 26, 1976
    Assignee: Stamicarbon B.V.
    Inventor: Christiaan G. De Vrieze
  • Process for the addition of additives to thermoplastics
    Patent number: 3975326
    Abstract: In processes for processing thermoplastic resins which processes require mixing the thermoplastic resin with an additive consisting of a salt of an aliphatic carboxylic acid, the improvement of mixing the salt of the aliphatic carboxylic acid with (1) an amide of an aliphatic carboxylic acid of at least ten carbon atoms and (2) a mineral oil that is substantially non-volatile under the processing conditions, to facilitate addition of a measured amount of the additive and to prevent discoloration.
    Type: Grant
    Filed: March 4, 1975
    Date of Patent: August 17, 1976
    Assignee: Stamicarbon B.V.
    Inventor: Christiaan G. de Vrieze