High flow, hydrogenated styrene-butadiene-styrene block copolymer and applications

a technology of hydrogenated styrene and styrene, which is applied in the direction of film/foil adhesives, braids, knotting, etc., can solve the problems of restricted techniques, achieve high flow, improve strength, toughness and elasticity, and reduce the transmission rate of moisture vapor

Inactive Publication Date: 2013-08-29
KRATON POLYMERS US LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]High melt flow hSBS polymers of the present invention in blends containing microcrystalline wax, polyethylene wax, naphthalene wax, paraffin wax, and less refined wax or combinations thereof are of interest in modified wax applications to improve strength, toughness, and elasticity, yet remain sufficiently ridged while maintaining a formulated viscosity of about 2,000-10,000 cps, more preferably 3,000-5,000 cps measured via cone and plate rheometry at 140° F. and 50 sec−1. Low temperature, impact resistance, lower moisture vapor transmission rate, and improved flex crack resistance are also beneficial features that the low viscosity polymers bring to ...

Problems solved by technology

These techniques may be restricted by high mel...

Method used

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  • High flow, hydrogenated styrene-butadiene-styrene block copolymer and applications
  • High flow, hydrogenated styrene-butadiene-styrene block copolymer and applications

Examples

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example 1

High Melt Flow hSBS Polymer

[0054]hSBS: 201 kg Cyclohexane and 9.1 kg styrene were charged to an 80 gal stainless steel reactor at about 50° C. 2428 mL of about 12 wt. % s-butyllithium were then charged to the reactor to initiate polymerization. The styrene polymerization was allowed to proceed at about 50° C. until completion and a sample was collected for GPC. The molecular weight at this step was determined to be 4.8 kg / mole. An additional 0.38 kg of styrene was added and allowed to polymerize. GPC analysis of this polymer indicated that the molecular weight was 5.0 kg / mole. Butadiene was added at a rate of about 1 kg / min. Within less than a minute of starting the butadiene program, 198 grams of 1,2-diethoxypropane were added and then the butadiene addition rate was increased to 1.5 kg / min. A total of 36.05 kg of butadiene was added, the temperature was maintained between about 50° C. and 55° C., and the polymerization was allowed to continue until completion. A sample collected a...

example 2

Fiberglass Mats and Scrim

[0055]The technology of the present invention is expected to provide impact resistance and enhanced toughness to composites containing fiberglass mats and scrims with significantly improved manufacturing and health, safety, and environmental aspects. The hSBS or hSBSS of the present invention having a melt flow rate >100 g / 10 min has sufficiently high molecular weight that it is not volatile and exhibits excellent elasticity and toughness while its high flow characteristics enable application as a melt blown fiber, fabric, or low basis weight film. At least 3 different processes can be envisioned to combine a tough, elastic high flow hSBS or hSBSS with a fiberglass mat or scrim.[0056]1. The melt blown fibers could be co-blown when the fiberglass is produced such that the tough, elastic fibers penetrate the thickness of the fiberglass mat.[0057]2. The film can be melt coated on top of a pre-existing fiberglass mat or scrim.[0058]3. The melt blown fabric or fi...

example 3

Low Viscosity Coatings

[0068]Low viscosity polymers (hSBS and hSBSS, as described above) are of interest in applications where VOC (volatile organic carbon) restrictions must be met. hSBS has a high melt flow rate (low viscosity) and was compared to other low viscosity polymers. It has been determined that only 4 VOC exempt solvents can be considered with hSBS, namely methyl acetate, p-chlorobenzotriflouride, t-butyl acetate, and acetone. In areas where non-VOC restrictions are acceptable, any non-exempt solvent (organic solvents that are not exempt) compatible with the low viscosity polymer may be employed. Exemplary non-exempt solvents are Aromatic 100 (a light aromatic naphtha), Aromatic 200 (a heavy aromatic naphtha), xylene, toluene, and the like. Coatings comprising a blend of solvent (exempt, non-exempt, or a mixture thereof) and at least 40 wt. % of the styrenic block copolymer of the present invention of hSBS or hSBSS have a VOC content of <450 grams / liter, preferably <350 g...

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Abstract

The invention relates to unique applications for the novel high melt flow, low viscosity, selectively hydrogenated styrene-butadiene-styrene (hSBS) or selectively hydrogenated controlled distribution styrene-butadiene/styrene-styrene (hSBSS) block copolymers, wherein the melt flow rate of said block copolymer is at least 100 g/10 min at 230° C. under 2.16 kg mass according to ASTM D1238. These block copolymers are novel and have the highest melt flow rate of any styrenic block copolymer also possessing high strength and elasticity. It has applications that prior to the present invention were not normally possible due to the normal low melt flow rate of styrenic block copolymers. The present invention also encompasses various fields of use such as a fiberglass hSBS or hSBSS reinforced mat, low viscosity hSBS or hSBSS coatings for industrial uses, hot melt adhesives prepared from hSBS or hSBSS blended with polyalpha-olefins, and elastic film, fiber, and nonwoven constructions using hSBS or hSBSS.

Description

FIELD OF THE INVENTION [0001]The invention relates to high melt flow, low viscosity selectively hydrogenated styrene-butadiene-styrene (hSBS, also known as SEBS) or selectively hydrogenated controlled distribution styrene-butadiene / styrene-styrene (hSBSS, also known as styrene-ethylene butadiene / styrene-styrene (S-EB / S-S)) block copolymers and applications therefore, wherein the melt flow rate is at least 100 g / 10 min at 230° C. under a 2.16 kg mass according to ASTM D1238. These block copolymers are novel and have significantly higher melt flow rates than other known styrenic block copolymers and also exhibit surprising high strength and elasticity. They have applications that, prior to the present invention, were not possible due to the normally low melt flow rate of styrenic block copolymers.BACKGROUND OF THE INVENTION[0002]Melt flow rate (MFR) is inversely correlated to viscosity of the polymer. A high melt flow rate means that the polymer has a low viscosity and vice versa. Whi...

Claims

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Application Information

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IPC IPC(8): D04H13/00C08K5/101C08K5/07C08K3/22D04H1/08C09J153/02C08J9/00C08L25/10D03D9/00C09D153/02C08K3/26
CPCC08K7/14C09D153/025C08K2003/265C08K3/22C08K3/26C08K5/07C09D153/02C08K5/101C09J153/02D04H1/4209D04H3/002C08F293/00C08L23/20C08L53/025C08L2205/02C08L2205/03C09J153/025D04H13/00C08K3/20C08K2003/2241C08L2205/035C08L23/12C08F8/04C08F297/044C08L2205/18Y10T442/10Y10T442/60Y10T442/56Y10T442/601C08L53/02C08L23/10C08J5/04C08L67/00C08L75/04
Inventor FLOOD, JOHNWRIGHT, KATHRYNSALAZAR, LYDIAKLUTTZ, ROBERT Q.DUBOIS, DONNWIEGAND, TROYMASUKO, NORIO
Owner KRATON POLYMERS US LLC
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