# US 10,767,018 B2 · Isotactic polypropylene based composite > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,018 B2 - Document ID: US10767018B2 - Status: Granted - Kind: B2 - Application number: 15/686,991 - Filed: 2017-08-25 - Published: 2018-03-01 - Granted: 2020-09-08 - Earliest claimed: 2016-08-26 - Applicants: Csir - Inventors: Ray Sinha Suprakas; Jayita Bandyopadhyay; Mary Khoza; Vincent Ojijo; Manfred Rudolf Scriba - Web page: https://patentgrep.com/patent/US10767018B2 ## CPC - C08J 3/005: {Processes for mixing polymers} - C08F 8/12: Hydrolysis - C08F 8/42: Introducing metal atoms or metal-containing groups - C08F 8/48: Isomerisation; Cyclisation - C08F 255/02: on to polymers of olefins having two or three carbon atoms - C08J 3/246: {Intercrosslinking of at least two polymers} - C08L 23/12: Polypropene - C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond - C08J 2323/12: Polypropene - C08J 2351/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond - C08J 2423/12: Polypropene - C08J 2451/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract This invention relates to a process for producing an isotactic polypropylene based composite, comprising: reactive blending of isotactic polypropylene homo-polymer; polypropylene grafted with a carboxylic anhydride or a furan type moiety such as maleic anhydride grafted polypropylene; and an amino silane such as (3-aminopropyl)triethoxysilane to produce an isotactic polypropylene based composite such that the crystallization temperature of the isotactic polypropylene based composite is in a range of about 120° C. to about 126° C. The reactive blending can further take place in the presence of an organically modified nanoclay. ## Claims ### Claim 1 A process for producing an isotactic polypropylene based composite, comprising: reactive blending of an isotactic polypropylene homo-polymer; a polypropylene grafted with a carboxylic anhydride or a furan type moiety; and an amino silane, in the presence of an organically modified nanoclay to produce an isotactic polypropylene based composite. ### Claim 2 (depends on 1) The process as claimed in claim 1, wherein an inorganic content of the organically modified nanoclay in the composite is kept constant in a range of about 0.5 to about 2 wt %. ### Claim 3 (depends on 2) The process as claimed in claim 2, wherein the inorganic content of the organically modified nanoclay in the composite is kept constant at about 1 wt %. ### Claim 4 (depends on 1) The process as claimed in claim 1, wherein a grafting level of the carboxylic anhydride in the polypropylene grafted with the carboxylic anhydride or the furan type moiety in the polypropylene grafted with the furan type moiety is in a range of about 0.5% to about 2%. ### Claim 5 (depends on 4) The process as claimed in claim 4, wherein the grafting level of the carboxylic anhydride in the polypropylene grafted with the carboxylic anhydride or the furan type moiety in the polypropylene grafted with the furan type moiety is about 1%. ### Claim 6 (depends on 1) The process as claimed in claim 1, wherein a molar mass ratio of carboxylic anhydride or the furan type moiety:an amino silane is in a range of about 0.5:0.33 to about 1:2. ### Claim 7 (depends on 6) The process as claimed in claim 6, wherein the molar mass ratio of carboxylic anhydride or the furan type moiety:an amino silane is about 1:1. ### Claim 8 (depends on 1) The process as claimed in claim 1, wherein a composition ratio of polypropylene:carboxylic anhydride or the furan type moiety grafted polypropylene is in a range of about 49:1 to about 1:1. ### Claim 9 (depends on 8) The process as claimed in claim 8, wherein the composition ratio of polypropylene:carboxylic anhydride or the furan type moiety grafted polypropylene is about 3:1. ### Claim 10 (depends on 1) The process as claimed in claim 1, wherein the polypropylene grafted with a carboxylic anhydride is a maleic anhydride grafted polypropylene. ### Claim 11 (depends on 1) The process as claimed in claim 1, wherein the amino silane is a (3-aminopropyl)triethoxysilane. ### Claim 12 (depends on 11) The process as claimed in claim 11, wherein the reaction between the maleic anhydride grafted polypropylene and (3-aminopropyl)triethoxysilane produces N-substituted maleimide-grafted polypropylene. ### Claim 13 (depends on 12) The process as claimed in claim 12, wherein the N-substituted maleimide-grafted polypropylene is represented by the structure: ### Claim 14 (depends on 1) The process as claimed in claim 1, wherein the organically modified nanoclay is nanoclay silicate layers. ### Claim 15 (depends on 14) The process as claimed in claim 14, wherein the nanoclay silicate layers is a 2:1 layered silicate modified with a thermally stable surfactant suitable for the preparation of isotactic polypropylene based composite. ### Claim 16 (depends on 15) The process as claimed in claim 15, wherein the thermally stable surfactant is a 2 hydrogenated tallow quaternary ammonium surfactant. ### Claim 17 (depends on 1) The process as claimed in claim 1, wherein the organically modified nanoclay is Betsopa OM™. ### Claim 18 (depends on 1) The process as claimed in claim 1, wherein the crystallization temperature of the isotactic polypropylene based composite is in a range of about 120° C. to about 126° C. ### Claim 19 (depends on 18) The process as claimed in claim 18, wherein the crystallization temperature of the isotactic polypropylene based composite is about 125.5° C. ### Claim 20 (depends on 1) The process as claimed in claim 1, wherein the crystallization temperature of the isotactic polypropylene based composite is in a range of about 126° C. to about 135° C. ### Claim 21 (depends on 20) The process as claimed in claim 20, wherein the crystallization temperature of the isotactic polypropylene based composite is about 129° C. ### Claim 22 (depends on 1) The process as claimed in claim 1, wherein the crystallization temperature of the isotactic polypropylene based composite is in a range of about 6° C. to about 13° C. above the crystallization temperature of a neat polypropylene polymer. ### Claim 23 (depends on 22) The process as claimed in claim 22, wherein the crystallization temperature of the isotactic polypropylene based composite is about 12° C. above the crystallization temperature of a neat polypropylene polymer. ### Claim 24 (depends on 1) The process as claimed in claim 1, wherein the crystallization temperature of the isotactic polypropylene based composite is in a range of about 13° C. to about 21° C. above the crystallization temperature of a neat polypropylene polymer. ### Claim 25 (depends on 24) The process as claimed in claim 24, wherein the crystallization temperature of the isotactic polypropylene based composite is about 15.5° C. above the crystallization temperature of a neat polypropylene polymer. ### Claim 26 (depends on 1) An isotactic polypropylene based composite produced according to the process as claimed in claim 1.