Liquid Tris(mono-alkyl)phenyl Phosphite Stabilizers for Polyolefins
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current phosphite stabilizers for polyolefins are not sufficiently compatible, leading to issues during melt processing, heat aging, and exposure to combustion products, particularly with polyolefins like polyethylene and polypropylene.
Innovation Solution
The use of tris(mono-alkyl)phenyl phosphite esters or mixtures thereof, which are in a liquid state at ambient conditions, as effective stabilizers to enhance compatibility and performance against deleterious effects such as melt processing, heat aging, and combustion product exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phosphite stabilizers are used, then stabilization function is provided, but compatibility with polyolefins is insufficient
Solution Approach 1:
The patent changes the physical state parameter of the phosphite stabilizer from solid to liquid at ambient conditions. This parameter change improves compatibility with polyolefins while maintaining the stabilization function, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The invention uses composite phosphite structures with specific alkyl substituents (combinations of alkyl groups at different positions on the phenyl ring) to achieve both liquid state and effective stabilization. The composite molecular structure provides both the required compatibility and stabilizing functionality.
2Adaptability or versatility
If liquid phosphite stabilizers are used, then compatibility with polyolefins is improved, but stability during processing and aging must be maintained
Solution Approach 1:
The patent carefully selects alkyl substituent parameters (chain length, branching, positions) to achieve the right balance: liquid state for compatibility while maintaining sufficient molecular weight and structure for stability during processing and aging.
Solution Approach 2:
The composite phosphite structure with specific alkyl combinations provides both liquid state properties for compatibility and adequate molecular complexity for stability during processing and aging, resolving the contradiction between adaptability and stability.
Data Source
AI summary
The present invention discloses a process for stabilizing polyolefin compositions against the deleterious effects of melt processing, heat aging and exposure to combustion products of natural gas, which process comprises incorporating or applying to a polyolefin an effective stabilizing amount of a tris(mono-alkyl)phenyl phosphite ester of the formula (I) or a mixture of phosphite esters of formula I, where each R is the same or different and is straight or branched chain alkyl of from 1 to 8 carbon atoms, and where said phosphite ester or phosphite ester mixture is in the liquid state at 25°C and 1 atm of pressure. Also disclosed is a stabilized composition comprising polyolefin and a present phosphite ester or phosphite ester mixture as well as certain mixtures of tris-(mono-alkyl)phenyl phosphite. The present liquid phosphite ester stabilizers are especially compatible with low density polyethylene.