Back to results
US 11,377,544 B2Granted
Polypropylene impact copolymers with reduced emission of volatiles
AssigneeCarmel Olefins Ltd.
InventorMichael Gishboliner
Life of this patent
Estimating the term…
Abstract
The invention provides polypropylene impact copolymer compositions with reduced emissions of volatiles for the automotive industry, particularly for interior applications in the automotive industry.
Claims12
A polypropylene impact copolymer composition (PIC) with reduced emission of volatiles, comprising:
- i) a Ziegler-Natta-prepared heterophasic polypropylene copolymer (HeCoPP) having an ethylene-propylene rubber content of between 15% and 40%, in an amount of from 40% to 70%;
- ii) a metallocene-prepared polypropylene homopolymer (m-PPH), in an amount of from about 30% to 59%;
- and
- iii) a chain length modifier (CLM) in an amount of from 0.01 to 1%;
- said three components being mixed in molten state, resulting in visbreaking said HeCoPP and m-PPH, wherein said emission of volatiles is at most 200 ppm when measured as VOC content according to VDA278 standard.
2 more elements
A process for manufacturing a polypropylene impact copolymer composition (PIC) with reduced emission of volatiles, comprising steps of:
- i) providing a Ziegler-Natta-prepared heterophasic polypropylene copolymer (HeCoPP) having an ethylene-propylene rubber content of between 15% and 40%;
- ii) providing a metallocene-prepared polypropylene homopolymer (m-PPH);
- iii) providing a chain length modifier (CLM);
- iv) gravimetrically feeding into a twin-screw extruder components including said HeCoPP, said m-PPH, and said CLM in respective amounts of 40-70%, 30-59%, and 0.01-1.0% to produce a blend;
- and
- v) cooling, pelletizing and drying the blend formed in step iv, thereby obtaining said PIC;
- wherein said components are mixed in molten state, resulting in visbreaking said HeCoPP and said m-PPH and in attaining emission of volatiles of at most 200 ppm when measured as VOC content according to VDA278 standard.
4 more elements
Dependencies are inferred from the claim text.