Vitrimer epoxy patents claim networks that reprocess through associative bond exchange, meaning the cured material can be reshaped or repaired without fully breaking down, and this dataset’s most-cited vitrimer record covers a eugenol-based system. Degradable epoxy underfill patents, by contrast, claim networks designed to cleave and fail on demand, typically for flip-chip electronics rework, and several of the oldest, most-cited US records in this space are underfill-specific. Both sit under the same C08G condensation-chemistry umbrella but solve opposite problems: staying together under stress versus coming apart when needed. A search strategy that conflates the two will miss relevant prior art in either direction.

Filing activity is led by a mix of Chinese research institutes, French university-industry collaborations, and specialty materials companies rather than a single dominant assignee. The dataset’s strongest collaboration cluster links a French chemicals major with two French research institutions, while several Chinese institutes and companies show the fastest recent-year growth in filing counts. No single assignee holds an overwhelming share of the 309 families, so competitive tracking needs to follow multiple filers rather than one incumbent.

Growth has flattened rather than continuing to accelerate. Filings rose from just 2 in 2017 to a peak of 52 in 2024, but the 2022 midpoint of 27 sits almost exactly at half that peak, suggesting the climb slowed well before the recent peak rather than compounding steadily. Because publication lags filing by roughly 18 months, the most recent one to two years in any such trend are always undercounted, so the true 2025-2026 filing rate is likely higher than currently visible, but the overall trajectory reads as maturing rather than exploding.