Conductive molding composition

Patent 4228050 Issued on October 14, 1980. Estimated Expiration Date:

January 15, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3770667

3833408

3842194

Disc record and method of compounding disc record composition
Patent #: 3960790
Issued on: 06/01/1976
Inventor: Khanna

Sound reproduction compositions
Patent #: 3975321
Issued on: 08/17/1976
Inventor: Heiberger

Vinyl chloride based injection molding composition
Patent #: 4129536
Issued on: 12/12/1978
Inventor: Martin , et al.

Molding composition Patent #: 4151132
Issued on: 04/24/1979
Inventor: Khanna

Inventors

Assignee

RCA Corporation

Application

No. 06/003363 filed on 01/15/1979

US Classes:

524/495, Mixing with carbon, e.g., graphite, etc., having numerical limitations, other than amount, e.g., included herein are particle size, surface area, etc., or composition or product thereof, DNRM252/510, With organic component252/511, Resin, rubber, or derivative thereof containing260/998.16, SOUND RECORD369/126, Electrical modification or sensing of storage medium (e.g., capacitive, resistive, electrostatic charge)369/276, Electrical track structure369/61, STORAGE OF DIRECTLY RETRIEVABLE MODULATED R.F. OR SUPERAUDIBLE CARRIER SIGNAL523/174, Phonograph record molding composition or process of preparing524/569Plasticizer additive

Examiners

Primary: Griffin, Ronald W.

Attorney, Agent or Firm

Morris; Birgit E.

International Classes

G11B 9/00 (20060101)
G11B 9/06 (20060101)

Abstract

An improved molding composition having a bulk resistivity below about 500 ohm-cm at 900 megahertz for compression molding video discs comprising sufficient conductive carbon black particles to obtain the desired conductivity, from about 1.5 to 4 percent by weight of stabilizers, from about 1 to 3 percent by weight of at least two lubricants, up to 10 percent by weight of plasticizers and processing aids, the remainder being a polyvinylchloride based resin, with the proviso that not more than about 5 percent by weight of liquid additives are present in said molding composition. Video discs molded from said composition have improved dimensional stability.