Polymeric Polypiperidine Stabilizers for Polyolefin Photodegradation
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Solution Overview
Problem
Synthetic polymeric materials, particularly polyolefins, face instability due to photodegradation and air oxidation, with existing stabilizers like HALS showing limited effectiveness and high production costs.
Innovation Solution
Development of high molecular weight polymeric polypiperidine compounds with specific structures that reduce migration within the material, enhancing stability against photodegradation and oxidative action, and a cost-effective synthesis process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HALS stabilizers are used, then some stabilization effect is achieved, but the polymeric materials remain subject to undesired deterioration and the stabilizers show high migration
Solution Approach 1:
The stabilizer is segmented into a polymeric structure with multiple repeating units, where each unit contains the active stabilizing moiety. This segmentation reduces migration because the polymeric stabilizer moves as a large molecule rather than individual small molecules, while maintaining the cumulative stabilizing effect through multiple functional units within the polymer chain.
Solution Approach 2:
The invention uses composite molecular architecture combining polymeric backbone with integrated stabilizing moieties. The stabilizer is not a separate additive but is chemically integrated into the polymer structure, creating a composite material where the polymer matrix and stabilizing function work as one unified system, thereby eliminating migration issues.
2Reliability
If known stabilizer compounds are used, then stabilization is provided, but their synthesis requires industrially expensive working conditions
Solution Approach 1:
The polymeric stabilizer is synthesized through step-growth polymerization where the stabilizing moieties are incorporated during the polymer formation process itself. This preliminary integration of the stabilizing function during standard polymerization operations eliminates the need for separate, expensive stabilization steps and reduces overall production costs.
Solution Approach 2:
The synthesis methodology changes from conventional low-temperature, high-pressure conditions to mild, ambient conditions. The step-growth polymerization proceeds efficiently at lower temperatures and atmospheric pressure, fundamentally changing the process parameters to be more economically viable while maintaining the same stabilizing performance.
Data Source
AI summary
The present invention relates to polypiperidine compounds of polymeric type which are capable of conferring to the polymeric materials, particularly to polyolefins, a high stability against photodegradation and oxidative action of air, belong to the HALS category and have general formula (I):wherein p is from 3 to 20;n is from 2 to 12;R and R1, which are the same or different, are selected in the group consisting of hydrogen, linear and branched C1-C12 alkyl groups, alkenyl groups having 3 to 8 carbon atoms and aralkyl groups having 7 to 19 carbon atoms;X and X1, which are the same or different, are selected in the group consisting oxygen and groups of formula (II)wherein R2 is selected in the group consisting of hydrogen, linear and branched C1-C12 alkyl groups, cycloalkyl groups having 5 to 12 carbon atoms and aralkyl groups having 7 to 12 carbon atoms;A represents a —(CH2)a— group wherein a is from 2 to 12, with the proviso that a is different from n;Z is selected in the group consisting of C1-C18 alkyl groups, groups of formula (III)wherein n, X, X1, R and R1 are as above defined,and groups of formula (IV)wherein R is as above defined;Y represents a substituent selected in the group consisting of the groups of general formula (V)the groups O—R4 and S—R4,wherein R3 and R4, which may be the same or different, represent hydrogen, a linear and branched C1-C18 alkyl group, a cycloakyl group having 5 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms or may form, together with the nitrogen atom to which they are linked, a heterocycle containing 5 to 7 carbon atoms;and the piperidine group (VI)wherein R and X are as above defined.The invention further relates to the processes for preparation of the compounds according to the invention.