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US4704423A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for producing molded article comprising hydrotalcite, EVOH, and olefin resin

Assignee: Mitsubishi Chemical Corp
•
Filing: 1986-05-09
•
Granted: 1987-11-03
•
Expires: 2006-05-09
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Abstract

Abstract A process for producing a molded article comprising a mixture of an olefin resin, which includes a residual chlorine due to a Ziegler type catalyst, a hydrolyzed ethylene-vinyl acetate copolymer and the hydrotalcite compounds having the formula: MxAly(OH)2x+3y-2z(E)z.aH2O (wherein "M" is Mg, Ca or Zn, "E" is CO3 or HPO4, "x", "y" and "z" are positive numbers and "a" is 0 or a positive number). The hydrotalcite is previously melt-mixed into the olefin resin in a proportion of 1/2z moles per mole of the residual chlorine in the olefin resin to 0.5% by weight based on the olefin resin to give an olefin resin composition, and the mixture of the olefin resin composition is melt-molded with the hydrolyzed ethylene-vinyl acetate copolymer. According to the process, the gel formation can be remarkably reduced, the long run processability can be remarkably increased, and the molded articles having excellent qualities can be obtained.

Inventors

  • 👤 Teruo Iwanami
  • 👤 Takamasa Moriyama

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 09:02
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08F; C08F6/00; C08K3/32; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/08; C08L23/0846; C08L23/0853; C08L23/10; C08L2207/00; C08L2207/06; C08L2207/062

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 135 words
In a process for producing a molded article comprising a mixture of an olefin resin which includes a residual chlorine due to a Ziegler type catalyst, a hydrolyzed ethylene-vinyl acetate copolymer, and a hydrotalcite compound having the formula: M.sub.x Al.sub.y (OH).sub.2x+3y-2z (E).sub.z. aH.sub.2 O (I) (wherein "M" is Mg, Ca or Zn, "E" is CO 3 or HPO 4 , "x", "y" and "z" are positive numbers and "a" is 0 or a positive number); the improvement wherein the hydrotalcite compound is previously melt-mixed into the olefin resin in a proportion of 1/2z moles per mole of the residual chlorine in the olefin resin to 0.5% by weight based on the olefin resin to give an olefin resin composition, and the mixture of the olefin resin composition and the hydrolyzed ethlene-vinyl acetate copolymer is melt-molded.
Claim 2
Dependent Claim 135 words
In a process for producing a molded article comprising a mixture of an olefin resin which includes a residual chlorine due to a Ziegler type catalyst, a hydrolyzed ethylene-vinyl acetate copolymer, and a hydrotalcite compound having the formula: M.sub.x Al.sub.y (OH).sub.2x+3y-2z (E).sub.z. aH.sub.2 O (I) (wherein "M" is Mg, Ca or Zn, "E" is CO 3 or HPO 4 , "x", "y" and "z" are positive numbers and "a" is 0 or a positive number); the improvement wherein the hydrotalcite compound is previously melt-mixed into the olefin resin in a proportion of 1/2z moles per mole of the residual chlorine in the olefin resin to 0.5% by weight based on the olefin resin to give an olefin resin composition, and the mixture of the olefin resin composition and the hydrolyzed ethlene-vinyl acetate copolymer is melt-molded.
Claim 3
Dependent Claim 16 words
The process of claim 1, wherein an upper limit of said proportion is 0.3% by weight.
Claim 4
Dependent Claim 17 words
The process of claim 1, wherein said hydrotalcite compound includes a metallic salt of higher fatty acid.
Claim 5
Dependent Claim 32 words
The process of claim 1, wherein a regrind of a laminated molding comprising the olefin resin composition and the hydrolyzed ethylene-vinyl acetate copolymer is used as a material of the molded article.
Claim 6
Dependent Claim 42 words
The process of claim 4, wherein a laminated molding having at least one layer of a mixture of (1) the regrind of the laminated molding of the olefin resin composition and the hydrolyzed ethylene-vinyl acetate copolymer, and (2) a polyolefin is melt-molded.

References Cited (Backward Citations)

US4085088A Cited
US4251430A Cited
US4433073A Cited
EP0139931A2 Cited
EP0165383A2 Cited
US4613644A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-11-02 1991-05-04 1991-11-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-11-02 1995-05-04 1995-11-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-11-02 1999-05-04 1999-11-03 $7700.00 Window Closed / Lapsed

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