Thermoplastic Polymer Composition Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Thermoplastic polymer compositions used in industrial applications face challenges with adhesive properties to polar resins, inorganic fillers, ceramics, and metals, particularly at low temperatures, and lack sufficient thermal creep resistance and flexibility across a broad temperature range.
Innovation Solution
A thermoplastic polymer composition comprising a mixture of hydrogenated block copolymers and a polar group-containing polypropylene-based resin, which includes specific weight ratios and types of polymer blocks, along with optional polyvinyl acetal resin, to enhance adhesive properties and thermal creep resistance without the need for primer treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermoplastic elastomer is used to achieve good weatherability and heat resistance, then adhesive property to polar resin and flexibility at low temperature deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of hydrogenated block copolymer (thermoplastic elastomer) combined with polar group-containing polypropylene resin. This composite approach allows the hydrogenated block copolymer to provide weatherability and heat resistance while the polar polypropylene resin contributes adhesive properties to polar resins and improved flexibility at low temperatures, thus resolving the contradiction between reliability and ease of operation.
2Reliability
If thermoplastic polymer composition contains styrenic thermoplastic elastomer and polar group-containing polypropylene resin to improve adhesive property, then flexibility and strength at low temperature deteriorate
Solution Approach 1:
The patent optimizes the weight ratio parameters of the components: hydrogenated block copolymer (100 parts) combined with polar group-containing polypropylene resin (10-100 parts). By carefully controlling this ratio and the molecular weight parameters of the polymers, the composition achieves both good adhesive property to polar resins and maintained flexibility at low temperatures, resolving the contradiction between adhesive reliability and operational flexibility.
3Ease of operation
If tacky agent composition is used to achieve tackiness, then adhesive property to polar resin and thermal creep resistance deteriorate
Solution Approach 1:
The patent extracts the tackiness function from the traditional tacky agent approach and integrates it into the hydrogenated block copolymer structure itself. The hydrogenated block copolymer provides inherent tackiness through its molecular structure while maintaining good adhesive property to polar resins and thermal creep resistance, eliminating the need for separate tackifying resins that would compromise performance.
4Reliability
If thermoplastic polymer composition is optimized for adhesive property, then handling as molded article and thermal creep resistance deteriorate
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: the weight ratio of polar group-containing polypropylene resin (10-100 parts per 100 parts hydrogenated block copolymer), the molecular weight of the polymers, and the composition ratios. This multi-parameter optimization ensures the composition achieves excellent adhesive property while maintaining good handling characteristics as molded articles and high thermal creep resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves excellent adhesive properties to ceramics, metals, and synthetic resins across a broad temperature range, with improved flexibility and thermal creep resistance, making it suitable for various industrial applications without the need for primer treatments.
Implementation Method 1
exhibits excellent adhesive properties to a ceramic, a metal, a synthetic resin or the like in a broad temperature range from low temperature to room temperature
Implementation Method 2
a polar group-containing polypropylene-based resin (B) based on 100 parts by weight of a hydrogenated block copolymer (A)
Data Source
AI summary
To provide a thermoplastic polymer composition, which can be adhered to a synthetic resin, a ceramic or a metal without performing a primer treatment or the like, is able to be handled as a molded article, exhibits an excellent adhesive property in a broad temperature range from a low temperature to room temperature and flexibility, and has high thermal creep resistance, and a molded article using the thermoplastic polymer composition. A thermoplastic polymer composition, which contains from 10 to 100 parts by weight of a polar group-containing polypropylene-based resin (B) based on 100 parts by weight of a hydrogenated block copolymer (A) in which block copolymer containing a polymer block (S) including an aromatic vinyl compound unit and a polymer block (D) including a conjugated diene compound unit is hydrogenated, in which the hydrogenated block copolymer (A) is a mixture containing a hydrogenated block copolymer (A1) having at least one tan δ local maximum value in a range from -60 to -40°C, in which a block copolymer represented by formula (i) or (ii) shown below is hydrogenated: (i) (S-D)n (ii) (D-S)n-D (in the formulae above, S is a polymer block including an aromatic vinyl compound unit, D is a polymer block including a conjugated diene compound unit, and n is an integer from 1 to 5); and a hydrogenated block copolymer (A2) in which a block copolymer represented by formula (iii) shown below is hydrogenated: (iii) (S-D)m-S (in the formula above, S is a polymer block including an aromatic vinyl compound unit, D is a polymer block including a conjugated diene compound unit, and m is an integer from 1 to 5); and a weight ratio of the hydrogenated block copolymer (A1) to the hydrogenated block copolymer (A2) is from 20:80 to 99:1.