PATENT CLAIM ANALYSIS

Application Number: 16078674
Application Type: Utility
Filing Date: 2018-08
Publication Date: 2019-02
Patent Classification: ["549", "274000"]

Abstract:
The present invention relates to a method for the catalytic synthesis of lactide from lactic acid. The method relates to the synthesis of lactide from lactic acid under the catalysis of a zinc oxide nanoparticle aqueous dispersion as a catalyst. The present invention has four technical characteristics: I. the zinc oxide nanoparticle aqueous dispersion catalyst has a sufficient surface area, and the size of nanoparticles is merely 30-40 nm, providing a sufficient contact area between the substrate (lactic acid) and the catalyst; II. the new catalyst has a milder catalytic effect on polymerization, allowing the molecular weight distribution of a prepolymer within a range of 400-1500 g/mol, which is advantageous for depolymerization to proceed; III. the new catalyst is stable, thus avoiding oxidation or carbonization in a high temperature reaction; and IV. the new catalyst has a low toxicity and a small threat to human health.

Claim (Index 4):
The method for the catalytic synthesis of lactide from lactic acid according to  claim 3 , characterized in that the addition amount of said catalyst in step S 100  is 0.3-0.6% by weight of said lactic acid.

Metadata:
- Claim Count in Document: 7.0
- Percentile: 96.0
- Lexical Diversity: 1.87356
- Patent Class: 549.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['12809216', '13595627', '15290647', '14422526', '12563885']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6970679055571027
- 35 USC 102 Novelty (BERT): 0.5048687830968388
- Combined Prediction Score: 0.6778479933110764
- Mean Citation Score: 205.514718
- Max Citation Score: 209.5321
- Similarity Product: 139.17039819884894

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 0
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test